Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b94437b2c2d0531…

MALICIOUS

PDF

67.4 KB Created: 2020-11-10 10:42:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7217616d9c1e2ef9042e82571b97a619 SHA-1: b2460081482b471f668e540b138bd55b5677ed20 SHA-256: 8b94437b2c2d0531a70d43d727fd1a4641b2d43cfce9b6475baf473896fbf503
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document contains a significant number of embedded URLs, many pointing to disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The presence of a malicious redirector link further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/strik?keyword=compact+k+cup+brewer In PDF document text
    • https://mubojage.weebly.com/uploads/1/3/4/3/134377346/9095328.pdfIn PDF document text
    • https://simipupipez.weebly.com/uploads/1/3/4/7/134716676/vafazibabeluzi.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/xirawi-ribuzetizug-falugasixim-vikit.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/dofuvitil.pdfIn PDF document text
    • https://negiwonilelif.weebly.com/uploads/1/3/4/5/134583179/fafezas_wipekewod.pdfIn PDF document text
    • https://gudojovevisepu.weebly.com/uploads/1/3/4/3/134314990/5394433.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8274c0ed-796a-4179-b79e-449bf1e3bd0b/guess_the_emoji_49.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dc0c059-4b67-4be1-b96d-194e4d7037fa/lamox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87f08b6c-fcfe-4fbe-851f-eb57d453d3ba/wovavafanepemubikevajuwil.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/gugimozosoxogotupekugonim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5632eebd-59b6-4701-ae2d-47434aa76a26/gezolojopixeponepipele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60a40114-37db-4344-99a7-b965a2ada726/10228271239.pdfIn PDF document text
    • https://s3.amazonaws.com/lopazura/82456752623.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_off0000caf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF8 5068 bytes
SHA-256: 158be95ff6fe6e07fa1781f08b068bd995a4cf6949ddf9cc414c20b11ebfca4e
font_01_sfnt_off0000dc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2A 10404 bytes
SHA-256: 1b0921311ab44c25a5ee1023c7050eec85579fdbff6027f390641306d1bfd06e

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