Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5c91adc99a0296…

MALICIOUS

PDF

69.7 KB Created: 2020-11-19 20:33:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e11a0f56c9b55d0b42b00cecdf3f415b SHA-1: 0b568740a679669ca7de49d65a8d39d61b0ebca5 SHA-256: ae5c91adc99a02968c81c1c9f3498699005d7b5d6599399220654cd16f7ad606
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, as indicated by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a link farm or redirection scheme. One of the embedded URIs, 'https://traffset.ru/123?utm_term=t+rex+bike+cost', is flagged as unknown, while another, 'https://s3.amazonaws.com/dixaleko/72910887564.pdf', is part of the link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=t+rex+bike+cost PDF link annotation
    • https://folukufisika.weebly.com/uploads/1/3/1/3/131384255/563986.pdfIn PDF document text
    • https://vanawolibonute.weebly.com/uploads/1/3/4/3/134344109/bixujiguvajekag_xononunodi_tiwiviv_gomevotowenoze.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/dixaleko/72910887564.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/biomaterials_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/the_wharf_ventura_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b28e0f7-52e9-41c6-8e99-2699fb18a1db/boxazukomike.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/nipigoravifibem.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/carbon_auto_theft_game_download_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/rascals_movie_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c55012b-03d8-4a79-af50-9e4d8c1dd5a2/96615552599.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/091ac60e-a896-42eb-af3b-b714eb8fc8d9/22607963813.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/lullaby_and_goodnight_sheet_music_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/563b1085-f8b3-421b-95ff-9e30fc0b4e71/parallel_circuits_worksheet_answers.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_off0000d49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49A 4772 bytes
SHA-256: a7b399b59a505ecb133b710ca7d0c9ffc5d1d5dc439808ff9ee13a3c3371cb8b
font_01_sfnt_off0000e4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F2 10980 bytes
SHA-256: a2a70f24a5c4ce544b50d23a7435b366c42160515fbaaad3e540f59b5069f1e9

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