Malicious PDF — malware analysis report

Static analysis result for SHA-256 86217212c5c90ed7…

MALICIOUS

PDF

65.3 KB Created: 2020-11-14 07:07:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fc27ea39864d823772c7cb1925f93cf1 SHA-1: db889e4b97b621640102c33404f889af027e0ff7 SHA-256: 86217212c5c90ed768e688a6d28498d9079257c5218217b16e8206636759c54f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, with the primary malicious URL being https://trafficel.ru/strik. The PDF's structure suggests it's intended to act as a link farm, potentially leading users to phishing sites or further malware downloads. No scripts were extracted, but the PDF structure and external links are indicative of a phishing or malware distribution attempt.

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://trafficel.ru/strik?utm_term=gray%252527s+anatomy+40th+edition+amazon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375342/normal_5f9fe5be5320e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425214/normal_5f9ae9a1d89f1.pdfIn PDF document text
    • https://vusipesokos.weebly.com/uploads/1/3/4/5/134585271/wejasuna-gusefetukoli-wobejezemosuwir-bamoxijog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388412/normal_5faf415ef2c19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368758/normal_5f9080ea8b630.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5f8716d9737ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380382/normal_5f8b30f98e075.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/fulazelof/imagenes_del_omoplato.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/aquaponics_farming.pdfIn PDF document text
    • https://s3.amazonaws.com/wejalixex/yu_gi_oh_card_template_deviantart.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/jurisprudence_exam_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/2794132909.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/brother_mfc-j430w_price.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/horizon_treadmill_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/mejoguzamutoxigunaterug.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_off0000c5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E6 5480 bytes
SHA-256: c6df0371704236e3d60fc487d9033b5068f1326ad1c502764cbe9fcc0af40af8
font_01_sfnt_off0000d87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87B 9212 bytes
SHA-256: 0f1853e64d3f43cde61b2c9c51d2490c892f91945417cdca119030a1c8748202

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