Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8244fd40a0980f5…

MALICIOUS

PDF

63.5 KB Created: 2020-11-25 01:00:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41f45dc0ae8947f156124a980dd6ecd7 SHA-1: dcea5bd82819b61e48abd3ccabc835a62ec73b8c SHA-256: d8244fd40a0980f514ad5e16b36662e45cb02159486abe22b15c5c988064610b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are obfuscated or lead to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM and PDF_URI heuristics. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The presence of numerous links suggests an attempt to direct users to phishing sites or download further malware, aligning with a spearphishing attachment attack pattern.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/strik?utm_term=fedex+fayetteville+nc+airport+rd
    • https://cdn-cms.f-static.net/uploads/4379500/normal_5f9564033870e.pdf
    • https://xumuxurubaxuk.weebly.com/uploads/1/3/4/5/134501003/c88e13f.pdf
    • https://cdn-cms.f-static.net/uploads/4392452/normal_5f920f135ade5.pdf
    • https://cdn-cms.f-static.net/uploads/4372383/normal_5f93aefa03938.pdf
    • https://cdn-cms.f-static.net/uploads/4373248/normal_5f8e6a9708e96.pdf
    • https://cdn-cms.f-static.net/uploads/4393018/normal_5f8e724851b5c.pdf
    • https://cdn-cms.f-static.net/uploads/4461498/normal_5fa2e186c4168.pdf
    • https://fejufawos.weebly.com/uploads/1/3/4/3/134328201/pefek.pdf
    • https://sevivuninuk.weebly.com/uploads/1/3/4/4/134459749/mutezan_vevekokot_botilukipe.pdf
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f98e121b8598.pdf
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/42e69e66f665d7f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/afccf849-51b4-427f-8435-a3467a464c87/23271218518.pdf
    • https://uploads.strikinglycdn.com/files/c07be328-1f4c-47c3-9de3-d0a6f24a5728/35088217098.pdf
    • https://s3.amazonaws.com/vapelurowar/florida_county_map_gis.pdf
    • https://s3.amazonaws.com/povelenavuviw/16033211875.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_off0000bafa.bin
825cf031dcc12cd59efbe804c8f828538fa432e4398bd5270bc72770cd25223b
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFA 5156 bytes
font_01_sfnt_off0000ccae.bin
5a81108b03a359e7a746c4159c5435b5f17041757bebe063b2ebe91c09771ade
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAE 11024 bytes