Malicious PDF — malware analysis report

Static analysis result for SHA-256 45f5234ad37d1048…

MALICIOUS

PDF

89.5 KB Created: 2021-05-17 14:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7356f7c8990bd4a5ed21124e805c030f SHA-1: 7da1290bc8b21b695edf05d5b56e9f7c618e77ac SHA-256: 45f5234ad37d1048345e5fb7de4b7bbba87017ae952fe857bce6a793aa70c37a
66 Risk Score

Malware Insights

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

The PDF file contains embedded URLs, one of which, 'https://dafemum.ru/strik?utm_term=2008+dodge+caliber+warning+light+meanings', is flagged as a potential lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further suggesting malicious intent. The ML classifier strongly flags this PDF as malicious. No scripts were extracted, but the embedded URLs and link farm heuristic point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/strik?utm_term=2008+dodge+caliber+warning+light+meanings
    • https://static.s123-cdn-static.com/uploads/4409798/normal_5fe496730fda3.pdf
    • https://cdn-cms.f-static.net/uploads/4486965/normal_602525ec2a5df.pdf
    • https://cdn-cms.f-static.net/uploads/4390350/normal_5fd200c618513.pdf
    • http://jafalule.22web.org/xagufuvubusoforikasinan.pdf
    • http://shmelev.pro/81956201964d63x8.pdf
    • http://flathead.us/bissell_proheat_2x_revolutiontm_pet_pro_carpet__upholstery_cleaner_reviewswjlcr.pdf
    • http://baltika-trans.ru/denim1hrmb.pdf
    • http://barberking.best/death_note_book_coverr1hnc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://legabukev.epizy.com/anabolismo_de_los_aminoacidos.pdf
    • https://uploads.strikinglycdn.com/files/33fc5a5c-0c19-48d3-9c3e-13748c6e161e/51312726268.pdf
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_db3ca5cabe004b169bba211a064ce531.pdf?index=true
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_f70438eeb2f54b16804e663e4d73d23c.pdf?index=true
    • https://s3.amazonaws.com/belapawerezuju/83811570451.pdf
    • https://uploads.strikinglycdn.com/files/b3a776d5-9dd4-4718-9002-a8d216932b96/37107772374.pdf
    • http://jesogini.rf.gd/58820858994.pdf
    • https://s3.amazonaws.com/kumasala/kitchen_cooking_utensils_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/fb004893-14a8-4576-a54c-0dfa2e3a7fcc/how_to_make_a_big_origami_heart.pdf
    • https://s3.amazonaws.com/tesotiwapax/free_apa_format_template_word_2010.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d44.bin
72784396e21b6b3427753ff0ff0eb00d6da12c6903e2bf236edadf52f4991734		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D44 5744 bytes
font_01_sfnt_off00012093.bin
2e8d2feb75eaefff12c5ed253020ee2795bcb137b3da37ea33639fa67485e5b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12093 12616 bytes
font_02_sfnt_off00014ac5.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC5 4324 bytes

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