Malicious PDF — malware analysis report

Static analysis result for SHA-256 06420f0f41ae7276…

MALICIOUS

PDF

94.9 KB Created: 2021-03-21 22:52:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bcbdfd8498a312027eeb5b5ac313931 SHA-1: ed60b6a23b217e08983031579b7fccf9c06845f2 SHA-256: 06420f0f41ae72763d85b65e18c3a50bc53a456f88bc550544309c532d0c6029
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs further supports this assessment. While no scripts were directly extracted, the document's structure and URL distribution indicate it's designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://lozipotod.ru/123?utm_term=calligraphy+handwriting+practice+sheets
    • https://static.s123-cdn-static.com/uploads/4465267/normal_5ff086818274c.pdf
    • https://cdn.sqhk.co/bularalunop/eJFcjih/jorukumekasoselukulitoje.pdf
    • https://static.s123-cdn-static.com/uploads/4371812/normal_5fcebdec62fbe.pdf
    • https://cdn-cms.f-static.net/uploads/4379605/normal_602f15dd015ed.pdf
    • https://cdn-cms.f-static.net/uploads/4383470/normal_604169b929556.pdf
    • http://nujilotadotila.iblogger.org/logivuwaxugopa.pdf
    • https://cdn.sqhk.co/suxevevagova/hehjEgi/navukavavovafe.pdf
    • https://cdn-cms.f-static.net/uploads/4492286/normal_60568fe8279b7.pdf
    • https://cdn-cms.f-static.net/uploads/4385436/normal_600ba500c47d4.pdf
    • https://cdn-cms.f-static.net/uploads/4414176/normal_60468316122c1.pdf
    • https://static.s123-cdn-static.com/uploads/4454543/normal_5fc5d95a0d385.pdf
    • https://static.s123-cdn-static.com/uploads/4403806/normal_5fc5d85bd59ed.pdf
    • https://cdn.sqhk.co/munenetifu/gcggggV/lejukiz.pdf
    • https://cdn.sqhk.co/juwasakekeja/EjhXDBi/supreme_stick_fight_mod_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://aca292c6-a3ee-4c96-b4c9-db15c8eca1b9.filesusr.com/ugd/cd1d52_b413587dfa29458d84546ccb0c324c48.pdf?index=true
    • http://gopuvobapeten.rf.gd/alt_codes_table.pdf
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_a552ebce0680484c979ecc2b0bc6345f.pdf?index=true
    • http://pevobipokuxatis.rf.gd/carol_ann_duffy_poems.pdf
    • http://muxawij.rf.gd/nojuluxubolelaso.pdf
    • https://uploads.strikinglycdn.com/files/9159d8b2-5c39-4a4f-bae2-c97b145dc05f/english_language_school_near_me.pdf
    • https://uploads.strikinglycdn.com/files/321aec3b-8c67-4d0d-9128-5d8590a358ee/what_is_the_best_hamilton_beach_single_serve_coffee_maker_walmart.pdf
    • https://uploads.strikinglycdn.com/files/f314479e-9522-4c02-9834-ea1ea0e0a5fd/kubota_v1505_engine_hp.pdf
    • https://bcbc83ff-a82b-4234-bf1d-c69e8cae54d5.filesusr.com/ugd/057c82_7260e34740db4a38900833b0cd6d05eb.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001338c.bin
5f205dfd43001150ef39e585892920f081f6c0e795e0f4e213bffa3072d354af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1338C 5436 bytes
font_01_sfnt_off00014613.bin
0931a6fe8725f5e83ab52ff0111f8fc1ec3fece147c0476572891c26ebf39742		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14613 11736 bytes

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