Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1fdabfb843ed08…

MALICIOUS

PDF

73.5 KB Created: 2021-01-27 01:18:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2a325801c7a30f3b437fc640103d6dc7 SHA-1: 9f63810087f10351a85dcde1b688e88a8eb11f5d SHA-256: 5c1fdabfb843ed08e4040d38109d45de369285fc305cff1e859a5f0308376153
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a link farm and ClamAV detection as a phishing trojan. The embedded URLs and the PDF structure suggest an attempt to manipulate search engine results or redirect users to malicious sites. No scripts were extracted, but the presence of numerous external links points towards a phishing or SEO poisoning attack.

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 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.
  • 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=milwaukee+toughshell+heated+jacket+home+depot PDF link annotation
    • https://binufigelivu.weebly.com/uploads/1/3/4/7/134775083/jopogojosoze.pdfIn PDF document text
    • https://cdn.sqhk.co/gegefemorosu/pTBidjj/space_attack_galaxy_hope_galaxy_shooter.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/icibidr/school_of_dragons_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/melivetipi/awjdggl/burijuxidipa.pdfIn PDF document text
    • https://mutosonagok.weebly.com/uploads/1/3/4/3/134316738/c9a56137da8.pdfIn PDF document text
    • https://cdn.sqhk.co/govazofaj/giNicO4/52190159988.pdfIn PDF document text
    • https://cdn.sqhk.co/bisegepamitu/gdtJxQt/counter_terrorist_agency_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rorazelesu/USjhjgl/47701938208.pdfIn PDF document text
    • https://cdn.sqhk.co/dorodidur/hdigaKV/fuxofef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/juvetaso/simakumikazesuxir.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/tudamubetam.pdfIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/wrinkle_in_time_worksheets.pdfIn PDF document text
    • http://tufobiwileke.rf.gd/gizmo_student_exploration_osmosis_answers.pdfIn PDF document text
    • http://wadokeg.epizy.com/58721565503.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A4 5628 bytes
SHA-256: a18fad933932cfb2ec8ae1a9874a27a160d82f4a37b993fb2cbad69952adb44e
font_01_sfnt_off0000f3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D8 11044 bytes
SHA-256: fe9d742947b398cfe1e8eed799e13b63fd193efbfbc4dc40094779f0a71e3f94

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