Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f287ff517f70c6e…

MALICIOUS

PDF

83.4 KB Created: 2021-04-27 23:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fe0506fff8cc10a6d0efd9b5b88239bd SHA-1: 2b3df8219012a94b4f9f5963c89ab15a61a4f91f SHA-256: 9f287ff517f70c6ed341b4cc72ed5cedc9248495ac8db13f0d65c9f172775e1a
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body and heuristics reveal a link farm structure with numerous embedded URLs pointing to external domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jacksth.ru/strik?utm_term=can+blood+type+b+drink+alcohol PDF link annotation
    • https://sonalopuxarore.weebly.com/uploads/1/3/4/3/134310538/dejejebupalabuluwaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407813/normal_60130da3369e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470545/normal_6005df1170558.pdfIn PDF document text
    • http://lightstart.xyz/what_does_yo_te_amo_meanama2d.pdfIn PDF document text
    • http://teasmall.space/best_annual_performance_review_template1gbsg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496584/normal_60653b0bd06d0.pdfIn PDF document text
    • https://nelurorinubix.weebly.com/uploads/1/3/1/3/131384252/guzedimazifujaxo.pdfIn PDF document text
    • https://wokoxulepimam.weebly.com/uploads/1/3/1/4/131438011/winivozivanazope.pdfIn PDF document text
    • http://kimagibasip.22web.org/fall_foliage_report_new_york_city.pdfIn PDF document text
    • http://xufededubumavif.scienceontheweb.net/sensory_integration_therapy_activities.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/bd2ba42c67f.pdfIn PDF document text
    • http://kisuvok.scienceontheweb.net/a_traves_de_cien_montanas.pdfIn PDF document text
    • http://kittyplay.online/colossus_bets_android_app8yhdn.pdfIn PDF document text
    • http://ihsteam.ru/66557387414u360g.pdfIn PDF document text
    • http://kagogumo.iblogger.org/16703948272.pdfIn PDF document text
    • http://dasezin.getenjoyment.net/23127293671.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuvatopuvonu.epizy.com/todanepilenubudipusodejox.pdfIn PDF document text
    • http://nobegik.rf.gd/all_games_apk_pure.pdfIn PDF document text
    • http://begafunif.epizy.com/koxuzowojo.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_off0000fd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD15 2900 bytes
SHA-256: a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a
font_01_sfnt_off00010757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10757 5192 bytes
SHA-256: c1e5b5fd58d5272cfe00edb15f54a997984cb537b37dbcbf16f604d4c64eed6b
font_02_sfnt_off000118fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FA 10972 bytes
SHA-256: b76d738c4f40678851965e37cb9f6a473d0010c257638617477a7e2d7ced08a3

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