Malicious PDF — malware analysis report

Static analysis result for SHA-256 494e44b04037ab72…

MALICIOUS

PDF

73.3 KB Created: 2021-02-09 09:52:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0228d364045a9ee582bf958f9f56a2a1 SHA-1: c7afb07b83edb79d5ec2f8db4ab42e71bd32ca9b SHA-256: 494e44b04037ab728a3dc11e3c48d19b744a2c7c0e9906d73634e254eca82652
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though obfuscated, contains keywords related to background images, likely serving as a lure to disguise the malicious nature of the links.

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://seumenha.ru/wb?keyword=background%20images%20for%20laptop PDF link annotation
    • https://jodisugej.weebly.com/uploads/1/3/4/7/134732418/5115534.pdfIn PDF document text
    • https://tesujirigagorin.weebly.com/uploads/1/3/4/8/134869290/2159823.pdfIn PDF document text
    • http://nudistoff.club/23195399210nnujq.pdfIn PDF document text
    • http://spain50off.info/bitcoin_wallet_sign_up_bonus_20203dh1z.pdfIn PDF document text
    • http://triple-doska5.club/4492877517634827.pdfIn PDF document text
    • http://pl50off.info/29615950747i97ki.pdfIn PDF document text
    • https://tetomorefaboma.weebly.com/uploads/1/3/1/3/131384600/bc2e88a6.pdfIn PDF document text
    • http://1xbets-reg.site/fanuc_robot_tcp_programming_manual01e5j.pdfIn PDF document text
    • https://xexiwimelogodit.weebly.com/uploads/1/3/4/5/134593193/lejarawenukot_luwikagel_nozut_ginatovewe.pdfIn PDF document text
    • http://im-marceting.site/gepejesesunob4gqel.pdfIn PDF document text
    • http://shopee24.site/jubinow8ozg7.pdfIn PDF document text
    • http://canlisohbetim.net/seralezibezasinofakaohi39.pdfIn PDF document text
    • http://car-test.pro/39555098766dvx9h.pdfIn PDF document text
    • https://gikoberi.weebly.com/uploads/1/3/0/9/130969260/6817da26cbd4cb.pdfIn PDF document text
    • https://pabazoba.weebly.com/uploads/1/3/1/3/131381204/6122258.pdfIn PDF document text
    • https://gifenatewa.weebly.com/uploads/1/3/4/4/134480542/7215c5cc1.pdfIn PDF document text
    • http://epipog.com/sample_employee_performance_self_appraisal_answersym3nc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE006 5588 bytes
SHA-256: 0d5329d2f3deaf84a00f873ee613e98b70b348760f3b644742cc9e80d7960c42
font_01_sfnt_off0000f2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FB 10940 bytes
SHA-256: e890ec2208b350b0b220075ab7f885d2bd1209b86c3840af41bde0e81f6f9db5

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