Malicious PDF — malware analysis report

Static analysis result for SHA-256 95731398849e2f13…

MALICIOUS

PDF

76.8 KB Created: 2021-04-03 07:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2278dcff725379c6a27371f37de5dc1c SHA-1: 389b1533ca30e5a785ec00c1cc7a8c49b0fdb56a SHA-256: 95731398849e2f13e5975b951f39664bba812f9b75f9b837c1376e3094d35fd0
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm. It contains numerous external links, many pointing to disposable domains, suggesting an attempt to redirect users to malicious content or phishing sites. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a keyword search, reinforcing the link farm nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jottigo.ru/award?keyword=design+patterns+java+interview+questions+pdf PDF link annotation
    • https://cdn.sqhk.co/gutinisiv/XidhiDT/basketball_wives_of_atlanta_season_8_episode_5.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/iFjamhc/16418140149.pdfIn PDF document text
    • http://tuderoba.getenjoyment.net/mopiwubufojopubiwuxi.pdfIn PDF document text
    • https://cdn.sqhk.co/xolokenuw/ybzggig/jepiboxanovasamunusajebe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427104/normal_5ff6008d8db99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446374/normal_6031bd55acbff.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/fhbm4jd/download_real_football_2020_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fazituku/ehiPlgg/32685011389.pdfIn PDF document text
    • http://tozofuji.scienceontheweb.net/classe_angiospermae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485296/normal_5fd0627726463.pdfIn PDF document text
    • https://cdn.sqhk.co/fasazani/eijcLSm/giruxolev.pdfIn PDF document text
    • https://cdn.sqhk.co/rifibimilo/gfnmgYw/12_irrational_beliefs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368999/normal_601951fa33710.pdfIn PDF document text
    • https://cdn.sqhk.co/bovutolomevo/vjfTijy/mirror_lake_colorado_directions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tafiwepamubov.atwebpages.com/dish_network_pay_my_bill_number.pdfIn PDF document text
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_c7b77f11be554a9592548070d7d112ef.pdf?index=trueIn PDF document text
    • https://b4e79a3f-0083-4b26-8056-4fe87fb46dfd.filesusr.com/ugd/332c1b_42b29ec6ef854fe894eddd496c1039b7.pdf?index=trueIn PDF document text
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_8d00fa3f5c43482cb235e023fb7c2ad7.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_off0000eea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA7 5528 bytes
SHA-256: 55202b5032e7fcc1128cecf742a2d87c15e26f0f3053f21b16e3f74c54652a56
font_01_sfnt_off0001019e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019E 10740 bytes
SHA-256: fbbc8b8b3067d7488b6ce6fe93ba1501981ec3a5c20508ac9eede9d32bd113c4

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