Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8daf566f0d4782d…

MALICIOUS

PDF

78.7 KB Created: 2021-05-16 05:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 766d9c37ddfd7ade51b359a0db055275 SHA-1: 5c80adc310c5fc1f63ae2193532fea411e5be9f2 SHA-256: f8daf566f0d4782dfc228e441f166c3e9ce3c729a556b7230eb3d820408c6eb8
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://midufefew.ru/strik?utm_term=call+of+the+wild+chapter+analysis PDF link annotation
    • http://volalagokiva.sportsontheweb.net/sogizirisemanuxob.pdfIn PDF document text
    • http://tadugebakonuged.getenjoyment.net/berger_paints_interior_colour_catalogue.pdfIn PDF document text
    • http://keysecret.ru/timezugogev26vee.pdfIn PDF document text
    • http://gouliwer.online/pc_games_download_for_free_windows_108i653.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/51d1b3cf-895f-4270-ac3c-ba657ecc44f6/how_to_learn_arabic_online_for_free_audio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05983beb-65df-456f-a3fe-374aff56f900/4388940008.pdfIn PDF document text
    • http://werexixudi.rf.gd/93374858759.pdfIn PDF document text
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_c60bebdc622f4cd783ef8eb6164e7742.pdf?index=trueIn PDF document text
    • https://dce579ed-4708-43c3-aaeb-2c76a6268d78.filesusr.com/ugd/944939_b523e6cfd053433ba6056ea2b839d4ae.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_c3726bc5f1a14f6d9a85d96221c35430.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1794df5b-0ec3-4325-8244-4d636ba6977c/60198702047.pdfIn PDF document text
    • http://fipuxogililego.epizy.com/2774355078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd03f253-1f91-42a2-ab3c-aa2b6975a355/descriptive_writing_questions_igcse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc01cd7c-8a7b-497b-9379-936cb76cd6fe/mtd_yard_machine_12.5_hp_38_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d0eae71-89fe-4250-bb07-ae12d6616fad/nella_larsen_passing.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_off0000f7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F4 5344 bytes
SHA-256: 4647587386e66cc5a9d78ed5eee251653019e38ca40008a6071067c03441235e
font_01_sfnt_off00010a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A33 10548 bytes
SHA-256: f14d62b4350b10a7f9884c0ac0a73fd48091339baa7ed32098e9d44e1bbdde93

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