Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57ca63faac6b266…

MALICIOUS

PDF

71.9 KB Created: 2020-11-09 23:32:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e1cf2a27cf4894ff7682cc7134237bf7 SHA-1: 271dd0498facd6a6e8e2b272766d8042eb709f84 SHA-256: a57ca63faac6b266ab97efe0484ffd71dc10622935c5d45270d6ba5a17fcb8cc
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 0.9997

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://traffine.ru/strik?keyword=dichotomous+key+lab+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456663/normal_5fa04f4e8da24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421782/normal_5fa61f5b519ed.pdfIn PDF document text
    • https://pakezumada.weebly.com/uploads/1/3/4/3/134368128/koruzap.pdfIn PDF document text
    • https://fizozedodid.weebly.com/uploads/1/3/4/4/134484686/be1b267e0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378604/normal_5fa2100993aee.pdfIn PDF document text
    • https://disaxugotusineg.weebly.com/uploads/1/3/1/8/131871710/b677984288.pdfIn PDF document text
    • https://kisigitoteke.weebly.com/uploads/1/3/3/9/133997396/govin.pdfIn PDF document text
    • https://dudikojegak.weebly.com/uploads/1/3/1/4/131406444/4136e6385dbb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393358/normal_5f9cf2c74c3f3.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/xaboxumenago_lexurira.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/4892010.pdfIn PDF document text
    • https://mejefarekobuk.weebly.com/uploads/1/3/4/3/134338461/ee7993b8e5e4796.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/62529937-b2f0-41d1-864c-b5818d96b2be/1607624868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad2f8a5e-b170-4fa8-87bf-960a4eb4f896/97009788936.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF51 5320 bytes
SHA-256: bf3a484353858ce9659ed46e10eb693ff5c282832da90f9e2a20c669b89a61e7
font_01_sfnt_off0000e159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE159 10248 bytes
SHA-256: 456507b963dcae2e28fe9bac05f46ead602aded9d3938e30b2e3529190d156ac
font_02_sfnt_off0001047a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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