Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4976e160d3bbdc3…

MALICIOUS

PDF

81.4 KB Created: 2021-04-24 01:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a5b92062b7442d3992d5008cfdf506e SHA-1: 168acb10bfacb4cd11aa05d20e6fd8d922d99df2 SHA-256: e4976e160d3bbdc3dc09d967d6e083a49042b93905fcdabc83af04ca8d3ddba7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting or suspicious domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs are indicative of an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://zajinet.ru/strik?utm_term=how+much+does+a+dog+license+cost+in+panel
    • https://lolifibek.weebly.com/uploads/1/3/4/6/134634661/2529039.pdf
    • http://segwaywheelchair.ru/amanush_2_bengali_full_movie_720pw3rmm.pdf
    • http://bostpolamos.site/what_channels_are_in_the_flex_pack59pcw.pdf
    • http://arboozfilm.com/tefefufuxusewekesizerowaqumhv.pdf
    • https://mibivatoroxup.weebly.com/uploads/1/3/4/7/134762409/1055209.pdf
    • http://petersikdar.com/can_you_cook_a_ham_in_a_roaster_ovenz016o.pdf
    • https://losuwasujiro.weebly.com/uploads/1/3/1/6/131637226/6000426.pdf
    • http://crawlmqyu.space/clinical_neurophysiology_mishra_free_downloadwebsz.pdf
    • http://13millions.store/wepoxakk2084.pdf
    • https://zemutixo.weebly.com/uploads/1/3/4/8/134865820/xujanuvog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_158798ffd33f4bffb450de8b1759f8c6.pdf?index=true
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_75001147d11e4313a6102b99be50e638.pdf?index=true
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_38392e7a956c426ba2de4ee5085d8b1c.pdf?index=true
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_21a0b7cd06784559a2bf143219fb04ac.pdf?index=true
    • https://s3.amazonaws.com/jifedefujodu/can_i_get_directv_on_amazon_fire_stick.pdf
    • https://s3.amazonaws.com/resixexi/the_dolls_house_short_story_questions_and_answers.pdf
    • https://s3.amazonaws.com/sazixipame/why_is_my_cloud_not_working.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fef1.bin
52dfa2359dab8788bb98166c86ae19f4997284588ae7cffa038016a8d94f32d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF1 5444 bytes
font_01_sfnt_off00011164.bin
4a0c3bdac1c9222dd1383b551be180e0f8b83b27fcfa3760fe9bb5e66096c0af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11164 11208 bytes

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