Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd0f50c4772f478f…

MALICIOUS

PDF

69.1 KB Created: 2020-12-16 06:50:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: aec45f9b3ca86ac9a3053f1640ad9bb1 SHA-1: 9b1bb5eb5a7c628f656d0a4a9d7612b638f2d795 SHA-256: dd0f50c4772f478fb09e31cd72cf68683d4327576768e859b8097558d704aab7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffnew.ru/123?utm_term=u+verse+movie+coupon+codes PDF link annotation
    • https://medefanitinov.weebly.com/uploads/1/3/4/3/134386417/duxikerob_lejagolikigi_dowopuvax.pdfIn PDF document text
    • https://kimulidorifuvup.weebly.com/uploads/1/3/4/8/134856260/a214bc4c7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404124/normal_5fd9666c6c3bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424029/normal_5fb5b6e35e2cf.pdfIn PDF document text
    • https://varavedonenen.weebly.com/uploads/1/3/4/3/134316352/zurapa.pdfIn PDF document text
    • https://kedixusivazusug.weebly.com/uploads/1/3/4/8/134869684/d079771cd2541.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/fowikorejodi/96208257484.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/bluestacks_android_emulator_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/naming_polyatomic_compounds_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/lacrimosa_piano_sheet_music.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_off0000cfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB3 5028 bytes
SHA-256: ec11c48faff375bb755ce5cb719e2df8e79b6078fd97bcf3cbe6248f7362ffaf
font_01_sfnt_off0000e0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C6 11516 bytes
SHA-256: 4bce29fda134f2f667932b985c230dae841341ae324e2ac8dcd65caf1f5830bc