Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef27d8ee3032527c…

MALICIOUS

PDF

78.2 KB Created: 2021-04-05 00:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6f232b86c25150311ce7889808c5165e SHA-1: ec74b50e9e2ae0287642adfc91e9e64e461fdbb3 SHA-256: ef27d8ee3032527c44f26f9af21af642ea0b8543d281dd4be6a7c3669ad73290
286 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a credential phishing attack. It impersonates Yahoo and uses a lure related to 'Fl studio email and password free' to trick users into clicking embedded links. The document also functions as a link farm on disposable hosting, directing users to various PDFs, some of which are hosted on potentially malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://bajurajatug.weebly.com/uploads/1/3/6/0/136054821/vopebuxumawifad-wojedefopirut-tiriwapev.pdf.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://midufefew.ru/strik?utm_term=fl+studio+email+and+password+free PDF link annotation
    • http://inglassrus.ru/can_tai_chi_help_anxietyh2x2q.pdfIn PDF document text
    • http://trysoda.club/9984042453h0u8b.pdfIn PDF document text
    • https://bajurajatug.weebly.com/uploads/1/3/6/0/136054821/vopebuxumawifad-wojedefopirut-tiriwapev.pdfIn PDF document text
    • http://golden-bridge.pro/cuento_corto_de_jorge_bucay_sobre_el_amorx1q1d.pdfIn PDF document text
    • http://priz24.site/book_review_essay_example88bh3.pdfIn PDF document text
    • https://jasutabaxe.weebly.com/uploads/1/3/0/8/130873915/7258102.pdfIn PDF document text
    • http://prizinsta.site/mikenobibun1vyn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a11f4016-53f0-4d4d-a7c9-011605b5fe18/dd_5e_planes_of_hell.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6e78dfb-fa8b-4351-8e8b-a785a641425f/79934187669.pdfIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_d8872663036549148ed8e2aaf2273098.pdf?index=trueIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_a2366463e363455e9e2121e267491827.pdf?index=trueIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_2ad7b9e2566647aca7098d07c9cf801b.pdf?index=trueIn PDF document text
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_a2783fb14a2f4052b4f6325dbe4ee292.pdf?index=trueIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_c7762f1ccc0e447c9ad29e6f538c425b.pdf?index=trueIn PDF document text
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_540a4d3cb8da410e830e2f8e297b9d56.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/73c4068f-fc33-4c88-891f-795b2c77fb76/ready_common_core_math_grade_4_answer_key.pdfIn PDF document text
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_f2ab2dac6fab40749540125411b232f3.pdf?index=trueIn PDF document text
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_0fec1b170c954af58b85613e19e2f474.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a73f4a8b-d55f-4cfb-b12f-5b7cb6a42bb4/best_medicinal_chemistry_books_for_pharmacy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79b7afa7-b4b8-4a88-a04a-96c9f0ccbacb/legukimamowifeziniwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/407b097a-fc80-4bc2-a297-917c4efd5d8d/what_is_the_best_ice_cream_machine_to_buy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b02c660-78b1-4247-9f2c-d55b8280d087/43292110631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d2e7c08-a33b-4c20-acc7-c5f39d091dc3/45448096259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73939f10-1086-4a22-bd74-5686c3a994c7/why_halogens_show_colour.pdfIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_515ed80769ee4781867e0723e0cd6370.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CC 5232 bytes
SHA-256: 8209068955f681f190b58080e95cf64d2a941e05651fc3f66597cac0899b27bd
font_01_sfnt_off0001048f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048F 10828 bytes
SHA-256: ab775a96499258354b0f7c8afd77fd6d0e2045983e184a2f1cbf96afa58e23bd

Open this report in the interactive analyzer, or submit your own file for analysis.