Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db8d7c6e7cbaae3…

MALICIOUS

PDF

74.3 KB Created: 2021-03-04 19:10:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd0460e7e3d57564b0d587d9ec2e2d04 SHA-1: 755ffc85ccd83c87124c000ce5b0822569cc97ee SHA-256: 3db8d7c6e7cbaae398c48f8c6f68c4f187fd961cdb66582801abc540c68c8045
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, with at least one identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, but the presence of multiple external URIs indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=is+hp+laserjet+pro+400+wireless
    • http://pakirekugep.scienceontheweb.net/zibilon.pdf
    • http://rubyshup.space/369202809312etn2.pdf
    • https://vinunawamezod.weebly.com/uploads/1/3/1/3/131380031/ad3c900.pdf
    • https://cdn.sqhk.co/jubawiwa/nDiiJib/mugoliwototi.pdf
    • https://cdn-cms.f-static.net/uploads/4476127/normal_60116325c1fd9.pdf
    • http://maturibcgj.space/apple_music_family_invite_android03hjo.pdf
    • http://lojapidabud.mypressonline.com/68697057977.pdf
    • https://cdn-cms.f-static.net/uploads/4385853/normal_5fe74e29978c9.pdf
    • http://jepenufi.getenjoyment.net/choke_chuck_palahniuk_review.pdf
    • https://lowonuve.weebly.com/uploads/1/3/4/5/134584544/8b30b4157.pdf
    • https://cdn-cms.f-static.net/uploads/4372076/normal_6023eff9b431b.pdf
    • http://copyrightshelpscenters.com/laboratory_report_8_epithelial_tissues_answer_keyyevcf.pdf
    • https://static.s123-cdn-static.com/uploads/4447096/normal_5fe28c05cbd58.pdf
    • http://topdiscount.pro/pain_in_the_heel_of_my_footj9lgt.pdf
    • http://folugomobok.getenjoyment.net/how_to_calculate_15_percent_tip.pdf
    • https://cdn.sqhk.co/ribobujir/hjhhjhK/mirexotavuzelig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://woranuganavot.myartsonline.com/jezezesudafolurekevakoni.pdf
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_40e9f00e3a9f4ca88f2dc5232ef5a16a.pdf?index=true
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_a223584b6b5044b3a47a8f3295ff8081.pdf?index=true
    • 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_off0000e5ad.bin
499640bb0b39568e612d4ece6cfbc34bb03cc915c2cc466bf92081418c9513c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AD 5244 bytes
font_01_sfnt_off0000f791.bin
87e9e2a9ffa13bf17b519a7903efa335afe7d67c18e842842282994db514a0aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF791 10940 bytes

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