Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8dc8fe48bc5b43…

MALICIOUS

PDF

72.1 KB Created: 2020-11-25 17:09:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5cf3ea0efcf778a1448fd5f6f4f87a4e SHA-1: 1cd95f021c687a5290918f023360dcd84bfa0e51 SHA-256: 6f8dc8fe48bc5b43649ab38ea84f2761f061f6d381876e277f84924a542339af
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying a 'mass external PDF link farm'. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to direct users to malicious or SEO-abused content, potentially as a phishing or spamming lure.

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://trafftec.ru/123?utm_term=animal+farm+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422876/normal_5fa468b724c99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424378/normal_5f9b69ba68320.pdfIn PDF document text
    • https://wonigebegi.weebly.com/uploads/1/3/1/6/131606731/bosozevipiki_bivibiperak_xegomafilibuno_kidoxiruv.pdfIn PDF document text
    • https://pesajupamobe.weebly.com/uploads/1/3/1/6/131607203/8e761.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/c43b2cf1-1051-4120-9f56-4f081653a7d1/medobejimavokabelir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9b7a82b-79ff-4865-b36e-8bfde2f7bc5a/ruvuvapakal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2744e57-87eb-4f84-b1d9-201367d5fc05/59519270238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7df72a8-8e9c-4e0d-909f-108501cfd160/relezobobema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed730977-8d3a-4d85-9203-d9f403f9e2ba/gemcraft_chasing_shadows_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/taxoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1606dff0-fef3-4bab-ad35-9612eec81866/terraria_character_designs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e90cedf8-0848-45a2-b3aa-a0fd56294ee2/college_football_rankings_2020_top_25_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad2b08c0-2885-4eed-b434-f5b538a65ad9/suwomelibu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d300455-3e45-4f9b-a694-a8c52d90033f/79548428250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c863c3e7-20b4-4811-9ac1-c99f01c84846/64018106806.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_off0000df5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5E 5268 bytes
SHA-256: fa3cf1f851cd902c847e4cc06a08db3fb6faa00a6c570a50785d2cb47b0d5617
font_01_sfnt_off0000f142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF142 9904 bytes
SHA-256: aac6d983bf9067decfe9b0d8694b1e1827aa054fa7fab1c76007c31aabb3c0a2

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