Malicious PDF — malware analysis report

Static analysis result for SHA-256 903b44bc5ee90214…

MALICIOUS

PDF

76.7 KB Created: 2021-06-09 22:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 927744c017abfe8a8722e8b4d26a4e3c SHA-1: 3b099984362ec157fbe880f5d9cf9a03fea949f9 SHA-256: 903b44bc5ee90214bb5dcede83b2356036264b2f905a4ef76d9fa7590f27df3b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://garglob.ru/pbw?utm_term=iphone+memoji+for+android PDF link annotation
    • https://ladupizisegi.weebly.com/uploads/1/3/1/3/131380895/53c685bd0.pdfIn PDF document text
    • https://nifavoweju.weebly.com/uploads/1/3/0/7/130739528/5886983.pdfIn PDF document text
    • https://fivepixulata.weebly.com/uploads/1/3/4/7/134747110/josakisezo.pdfIn PDF document text
    • https://momexifolel.weebly.com/uploads/1/3/4/3/134319719/0e59a8e9b.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/8380f168-9bec-4e2b-ab26-244695e1d890/what_does_4_22_mean_spiritually.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d24535fd-c1b3-4491-b411-a21babb1e4fb/nogegemebiwisumu.pdfIn PDF document text
    • http://kigiputilik.pbworks.com/w/file/fetch/144937659/32486721690.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f61bcc2e-f3c7-49f2-a9e1-e1c9d072bc3c/76531059956.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f5ae73e-be87-4b56-a7dd-0515fe7eca75/the_endocrine_system_is_responsible_for_all_of_these_except.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e62e25c-af39-4f39-bc71-d1ec24790b26/dolefazafuzalipubofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07d3d977-cf6a-4f92-bb1e-9c0e6d24df45/sulorowopobopajipoze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f6e78d9-aa77-4662-acd5-2b9aa637f1f2/rexuxadedopo.pdfIn PDF document text
    • http://mupalunava.pbworks.com/f/44550168628.pdfIn PDF document text
    • http://zofurutatag.pbworks.com/f/biology_book_9th_grade_prentice_hall.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93831975-82f1-4843-a57e-c68f26f3f09e/difference_between_nasb_1977_and_1995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8068955d-7105-4bec-9110-2d4c73b05ff6/76109012751.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144574977/guia_par_biomagnetico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/008cd279-f1c0-45f3-8489-d03a9bfac1ab/how_to_draw_a_heart_step_by_step_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca2fb0cb-4b7d-43ae-890a-36111c013797/how_to_install_kenmore_elite_dishwasher.pdfIn 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_off0000eefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFB 5084 bytes
SHA-256: 80cfe8eefc8272ae67f73902cd5a785d6705d099dc151b936a4847db5ba8801c
font_01_sfnt_off00010021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10021 11036 bytes
SHA-256: 87a66734970cca881a74faf13c504e5729d11a39d0d3dd937a3c96d075658487

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