Malicious PDF — malware analysis report

Static analysis result for SHA-256 185b00642f1bb12e…

MALICIOUS

PDF

123.2 KB Created: 2020-11-13 23:52:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a78b0d608be1132fe9c25162ec7947e SHA-1: 5338befa18aff649838857b91b7e94cddfd6d04a SHA-256: 185b00642f1bb12e24db95880c868a79e0f61d4438ac7d75b0107a4380864573
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, indicating it hosts numerous external links. One of these links, 'https://trafffe.ru/aws?utm_term=the+way+you+are+bruno+mars', is flagged as unknown and is likely malicious. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffe.ru/aws?utm_term=the+way+you+are+bruno+mars
    • https://cdn-cms.f-static.net/uploads/4366398/normal_5f991489a179a.pdf
    • https://cdn-cms.f-static.net/uploads/4379355/normal_5fa0765d390ac.pdf
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/nudadusasebovav.pdf
    • https://cdn-cms.f-static.net/uploads/4379485/normal_5fa43089582cd.pdf
    • https://cdn-cms.f-static.net/uploads/4392193/normal_5f976eae1ffcb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8e8a9bec-f979-445e-8f5b-75aaf7cbc5d8/fichas_de_domino_para_imprimir_y_recortar.pdf
    • https://uploads.strikinglycdn.com/files/a7e0747f-28c2-4390-863d-6e958b303b02/56432130297.pdf
    • https://uploads.strikinglycdn.com/files/7c61384d-732b-4b67-9fd8-857497d17639/three_levels_of_a_product_by_using_the_hamarvik.pdf
    • https://uploads.strikinglycdn.com/files/908891e5-c355-4b56-8678-74865797bad3/best_feats_for_a_warlock_5e.pdf
    • https://uploads.strikinglycdn.com/files/ff5cb776-b7a6-41f2-b783-21ee207b297a/energy_review_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/75213f59-47b3-4331-8cfd-65ec3f32c612/89584031226.pdf
    • https://s3.amazonaws.com/wunupalezozerud/home_alone_piano.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016ac8.bin
ab9e6802fb5430b80800e831b285c7a635bfc4fd0c06e1abfc00dc510813b7aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16AC8 6444 bytes
font_01_sfnt_off000180be.bin
d80e6495f6cdf9da019a28408904629cea59a8f91d393162f8bb083f5b228490		 pdf-font-stream PDF embedded font (sfnt) at offset 0x180BE 4928 bytes
font_02_sfnt_off00019157.bin
3700a2cd672692f4f12d697e165ff830c7453ef1d65efca5329aa52baf49c491		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19157 13904 bytes
font_03_sfnt_off0001bc06.bin
15a68420f1c377824b8c1fd571ac7c30556db1b4bc05006bf44ec3f6c6c83208		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC06 16120 bytes
font_04_sfnt_off0001d0ed.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0ED 4324 bytes

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