Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd76d5677366aede…

MALICIOUS

PDF

84.3 KB Created: 2021-02-23 12:11:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4a28df848e595e8b3ea444d04c628975 SHA-1: 4308d9c91caca75cd4238e0a5d5ff474d7b02f81 SHA-256: cd76d5677366aede699bb9d0826a2e561264b00f49a245854a53275905539c80
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of URLs like 'https://jacksth.ru/wix?keyword=atomic+habits+pdf+download+free' indicate a deceptive attempt to trick users into downloading content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://jacksth.ru/wix?keyword=atomic+habits+pdf+download+free PDF link annotation
    • https://cdn.sqhk.co/xolilipedeko/gcii9if/alien_invasion_monster_truck_shirt.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/hjvhijg/elements_of_a_story_plot.pdfIn PDF document text
    • https://nikizatul.weebly.com/uploads/1/3/5/3/135309179/vugeranubitiju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474445/normal_5ff32bc63e945.pdfIn PDF document text
    • http://bnl-jobs.com/argyle_house_school_uniform0t4ch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426550/normal_5fdd33049f1f4.pdfIn PDF document text
    • https://cdn.sqhk.co/rosivapixove/hngjf9n/pexels_app_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460055/normal_6002dec8b821f.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwopazeg/XJhhFsO/sakemuvukutoxotapanojodi.pdfIn PDF document text
    • https://genoduvule.weebly.com/uploads/1/3/1/4/131407197/ca260f7.pdfIn PDF document text
    • https://soluvixam.weebly.com/uploads/1/3/0/8/130873975/zevuwadawatusimuvelo.pdfIn PDF document text
    • https://xegoratan.weebly.com/uploads/1/3/2/7/132712572/2712357.pdfIn PDF document text
    • http://avtovishki-msk.ru/16981426846a8u0g.pdfIn PDF document text
    • http://tefulen.iblogger.org/fafutorudisovok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459937/normal_6023ce472174e.pdfIn PDF document text
    • http://mujogatebili.22web.org/rimalatival.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tubujaj.epizy.com/pipavuzafor.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/sahih_al_bukhari_free.pdfIn PDF document text
    • http://mojefujal.rf.gd/arthritis_and_rheumatology_journal_author_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/arabica_coffee_production_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFF 5404 bytes
SHA-256: 97d91e6cd24c61b81bb23b9244448be0b915a3906bf8d505a46d96d4bbe8450d
font_01_sfnt_off00011138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11138 10596 bytes
SHA-256: efb1282b9c446ce5b4846731f09ebb57820e17ccb05350e7e5cf582464966c1d
font_02_sfnt_off00013567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13567 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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