Malicious PDF — malware analysis report

Static analysis result for SHA-256 c547e11107be15f3…

MALICIOUS

PDF

65.2 KB Created: 2020-11-11 23:02:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 83f93e1f53dbb8e19a898371f0a02e62 SHA-1: bfb96e5b8355d2dcebcdeaed224ccfe72f441f4b SHA-256: c547e11107be15f3487c9373497b0e0f9c19c41bb8168e756bc0bc30b947842d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a PDF link farm containing numerous external links. The ML classifier and ClamAV also strongly indicated maliciousness. The presence of embedded URLs, particularly 'https://traffset.ru/123?utm_term=prince+albert+saskatchewan+pictures', suggests a redirection or phishing attempt. The document body, though heavily obfuscated, contains metadata related to its creation, which does not detract from the malicious indicators.

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://traffset.ru/123?utm_term=prince+albert+saskatchewan+pictures PDF link annotation
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/7360136.pdfIn PDF document text
    • https://posoxunek.weebly.com/uploads/1/3/4/4/134460252/zavogisubuz.pdfIn PDF document text
    • https://vibebivenef.weebly.com/uploads/1/3/1/4/131412032/roxebixa.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/wejuvono/frq_ap_biology_2012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62f8c069-99d2-43c6-94c9-4e69b4a133c7/wowidewifuxovarisoda.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/andrew_lloyd_webber_memory.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/40870324643.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/abbreviated_injury_scale.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/the_safavid_empire_culture.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/biodata_format_for_bank_job.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb82d483-9187-4d4a-a260-e487cb394e76/sazaxeke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feac78bf-75ed-4ce5-ac86-5ffbe0a372fb/35453442918.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/synonyms_and_antonyms_for_cds_exam.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_off0000befc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFC 5320 bytes
SHA-256: 35a734cf753c76d6b35b0c1cf2d1131233ff5061ad50b8eb41497cda962db8a1
font_01_sfnt_off0000d116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD116 11512 bytes
SHA-256: c5d3d7ca260dc208c9b46a249529637b90327ed91770ddb89b13bbbceb63438b

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