Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5d360fe54012df…

MALICIOUS

PDF

67.5 KB Created: 2020-11-25 16:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 128ea7f4557d24ed30200b9db37430ff SHA-1: 9037a7ee587ab1210bda2131713e5071f91238d6 SHA-256: bc5d360fe54012df210e4eaf3e1325f82592b50b5d32c4af04c1b066cf393ccf
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

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/123?utm_term=sony+bdp+s185+no+sound PDF link annotation
    • https://jigejoxipivigif.weebly.com/uploads/1/3/4/7/134731155/9f4cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369512/normal_5f978a47d683f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379374/normal_5f9c9b88cc7b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389599/normal_5fbcbae999505.pdfIn PDF document text
    • https://bimonodinedijov.weebly.com/uploads/1/3/4/6/134697137/lerafifiluda_sajuxesulekubaw_raned_tobukefu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415065/normal_5fa0f65d9a1ae.pdfIn PDF document text
    • https://tovigaxibikufa.weebly.com/uploads/1/3/4/8/134875165/juxidaxifedorop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449422/normal_5fb55a502ab6a.pdfIn PDF document text
    • https://masejufubalabej.weebly.com/uploads/1/3/4/3/134388341/af6a4ada32a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408330/normal_5fa0af2e4a703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402486/normal_5f925801d2fc3.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/bf9609b4-27c2-4e4d-9d64-a07028ca85bd/36183981364.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/free_horse_head_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/witch_hunter_crossbow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21106277-69e0-49d4-8dc6-cfd771e4fd40/muppet_treasure_island_pc_game_downl.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_off0000ca58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA58 5332 bytes
SHA-256: e359de89b07001470800e3a9111371df11389513441374af73590ac08442d957
font_01_sfnt_off0000dc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9E 10864 bytes
SHA-256: 3a8a87b19ea5cffbdfa4b43986452ebe726164734c7f9b15ef1cac15a2ed6998

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