Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9d9cf4fc3a4178…

MALICIOUS

PDF

68.9 KB Created: 2020-11-16 21:36:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6618b9069aaa73a603e360e2c453f3be SHA-1: 22816aa54ea87e444fd721f2e2de7f55f258523a SHA-256: 0b9d9cf4fc3a417836b3d0c978d0a9e1a90bdbb485d494ea465135028baca28e
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafffi.ru/strik?utm_term=otorrinolaringolog%25C3%25ADa+costa+rica PDF link annotation
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/3532345.pdfIn PDF document text
    • https://rikurifijuse.weebly.com/uploads/1/3/4/6/134681474/jomukirenetalezatobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466996/normal_5fa7f8378fc7c.pdfIn PDF document text
    • https://relogeseji.weebly.com/uploads/1/3/0/7/130739887/zipiwinaj-fixebokobawosuf.pdfIn PDF document text
    • https://rilebowiteb.weebly.com/uploads/1/3/3/9/133986594/2808487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408720/normal_5f99f545d9012.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/tuxenipup/diabetes_definicion.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/80211536166.pdfIn PDF document text
    • https://s3.amazonaws.com/takeju/mama_do_you_love_me_book.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/white_gold_tower_eso_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/nabesabixerosan.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/khan_tv_live_cricket_streaming.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/muxixafapigoxifez.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_off0000ce0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0D 5048 bytes
SHA-256: 431fb99fe1a9457803ad3fd6ac79ed8f168acc8e5edb7c63bbd5b8d0f4b26fa4
font_01_sfnt_off0000df46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 11616 bytes
SHA-256: d72e3586b8d8c9aa538144539cea8f5307bc8ab7aab19e46d5b7c658f1df6116