Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac535818c04f58be…

MALICIOUS

PDF

71.7 KB Created: 2021-01-06 01:44:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19d8b532f6b5739b3305b4933e543a54 SHA-1: 855f586eb02963e2469bf872a60e5ba9206e6604 SHA-256: ac535818c04f58be68e2e7078ffdfc834c0e8c4cc8900b53c05c85400a4d3d90
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating it is part of a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/aws?utm_term=greeting+island+invitation+templates
    • https://ridewavovelomu.weebly.com/uploads/1/3/4/6/134697160/lelepegojodafufago.pdf
    • https://lonerunit.weebly.com/uploads/1/3/4/0/134017922/8095140.pdf
    • https://cdn.sqhk.co/jesisuvov/hhXd5ie/can_a_photo_scanner_scan_documents_on_iphone.pdf
    • https://cdn.sqhk.co/duwutawuna/chfjbdr/42886543311.pdf
    • https://cdn.sqhk.co/losokifape/if4AhbL/32932453453.pdf
    • https://sizomejuxitiz.weebly.com/uploads/1/3/4/7/134748976/2991042.pdf
    • https://gabodubelekopo.weebly.com/uploads/1/3/4/3/134356924/b59afa5eab99311.pdf
    • https://cdn.sqhk.co/kokuxisa/Bjfhegi/33799884367.pdf
    • https://fukuperuka.weebly.com/uploads/1/3/4/8/134883813/jepoborizazodafumimu.pdf
    • https://jinikegubu.weebly.com/uploads/1/3/4/8/134873825/lugixuwo-toregifafoti-midirekerat.pdf
    • https://static.s123-cdn-static.com/uploads/4378153/normal_5feb9e9e69e93.pdf
    • https://sijudunewofas.weebly.com/uploads/1/3/4/6/134696620/donozanijezoj.pdf
    • https://cdn.sqhk.co/tulazofava/gtgjOFS/sufodezowomegenuwanuj.pdf
    • https://cdn.sqhk.co/vigesiji/bjcRSWn/chain_reaction_game_show_2020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vavebufevodutob/engineering_drawing_filetype.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_off0000da0a.bin
2ba3e4181ee318a8ee085a40bba9cd5482cbbd58f30e165ce75337c58fa3c59a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0A 5368 bytes
font_01_sfnt_off0000ec41.bin
82eba7d2167132459c054a6a49f4ae91099959695c14af3123fd467fc6e32b5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC41 10988 bytes