Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fcf8ea837f1af58…

MALICIOUS

PDF

82.4 KB Created: 2021-04-01 10:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4dad5d59a48aa1db3541226c8b4f90c9 SHA-1: 99ad06fd2760d0fb953ed2d87fccd611ded32d0b SHA-256: 7fcf8ea837f1af586ec2e88796df8cf1884fb8c90a7bad8bec39f5177657929d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm or SEO manipulation scheme. ClamAV and an ML classifier also flagged this PDF as malicious, specifically identifying it as a phishing or trojan variant. The presence of embedded URLs and the link farm heuristic strongly suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=civ+4+mods+fall+from+heaven
    • https://murasujudadalox.weebly.com/uploads/1/3/5/3/135338307/jozogotojixaluvoxuke.pdf
    • https://static.s123-cdn-static.com/uploads/4378161/normal_5feb4f01384f5.pdf
    • https://losarofimet.weebly.com/uploads/1/3/1/3/131384333/faabb.pdf
    • http://instasale.company/active_and_passive_voice_exercises_grade_663fvl.pdf
    • https://xonodomewavewa.weebly.com/uploads/1/3/5/3/135316089/zobufajazozajijo.pdf
    • https://jozufibajas.weebly.com/uploads/1/3/0/9/130969385/331d5.pdf
    • https://vasoxalevevox.weebly.com/uploads/1/3/4/4/134477515/6408820.pdf
    • https://puvugopusu.weebly.com/uploads/1/3/2/7/132711965/a096b2.pdf
    • http://domotoj.sportsontheweb.net/61697932245.pdf
    • https://nepopuzabigeju.weebly.com/uploads/1/3/4/8/134856357/vabopudivafamuvogur.pdf
    • https://static.s123-cdn-static.com/uploads/4369164/normal_5ffb1fb7556c1.pdf
    • https://cdn-cms.f-static.net/uploads/4424683/normal_60354843e7c10.pdf
    • http://prizinsta.online/734551565019w137.pdf
    • http://snegny.com/73442468617iqu2w.pdf
    • http://mikovil.mywebcommunity.org/lg_wireless_headphones_for_smart_tv.pdf
    • https://cdn-cms.f-static.net/uploads/4419423/normal_600aec8a93143.pdf
    • http://skameyki.club/piparuwikbq8ps.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jesidofefe/american_standard_freedom_80_two_stage_filter_replacement.pdf
    • https://s3.amazonaws.com/jadudusujuje/animal_colouring_sheets_free.pdf
    • https://s3.amazonaws.com/luworizesupox/chronic_cystitis_treatment_guidelines.pdf
    • http://boxijekew.atwebpages.com/85453613194.pdf
    • https://s3.amazonaws.com/retisovojor/habit_3_put_first_things_first_examples.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8ad.bin
485c000de6004ad4839314b63b0edf65bcd0ae73b2c25b0e6e322f53df75ac34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 5200 bytes
font_01_sfnt_off00010a35.bin
c242b28d55d5bfc31c956779dfe6b4e40c01d938a19b9ea6b9b337316f568395		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A35 16212 bytes

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