Malicious PDF — malware analysis report

Static analysis result for SHA-256 a263da6472b68395…

MALICIOUS

PDF

66.5 KB Created: 2020-12-07 23:54:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 18bb265b504c753f3d87dde701da7854 SHA-1: bc011c2d5abd70f2a88c04b9de019aa179f128d3 SHA-256: a263da6472b683958afaa15422db708cf9f0bfa9be4f83ebbdc6882abfc7058d
156 Risk Score

Malware Insights

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

The PDF file, disguised as a calculus worksheet, contains a significant number of external links, indicating a potential link farm or phishing attempt. ClamAV detected it as Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0, and an ML classifier also flagged it as malicious. The presence of embedded URLs and the heuristic PDF_SEO_LINK_FARM strongly suggest malicious intent.

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=calculus+riemann+sum+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412394/normal_5f95bd662f8b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471091/normal_5fb5380302711.pdfIn PDF document text
    • https://paxepufa.weebly.com/uploads/1/3/4/6/134640660/vipufowil_puferuked_wanalaruwenoxop_dosofebad.pdfIn PDF document text
    • https://nibojesuko.weebly.com/uploads/1/3/4/3/134329062/4086695.pdfIn PDF document text
    • https://zudizobi.weebly.com/uploads/1/3/4/8/134860565/7174801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416921/normal_5faed151e747a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbfeb102bbd74065800e14d/t/5fc23b8a1972c46e3ce87008/1606564750454/89211417762.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/lujato.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/molaseton.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/wupatuxomazuvome.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfd8672f8b574a0f39532/1606221191144/87607120430.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/81100451726.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_off0000c693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC693 5100 bytes
SHA-256: 79721f4ecdd8f5b580b67b0b13b96c7dddd3185ec6a75141b7e882ac8110269d
font_01_sfnt_off0000d7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CC 11616 bytes
SHA-256: 27d87d056a698f6ed9107cca4aa90901ac066e2895df9be56fa8c07269297221

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