Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7c74bc751bb934…

MALICIOUS

PDF

177.9 KB Created: 2021-04-23 10:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f996e3125e784f59aba8881376121c93 SHA-1: ec337454b49df533b81dc1f0f24362160ce16279 SHA-256: 4a7c74bc751bb9342ebed08eeaa33fb62263b852c1e370d6a4a9f05e35924569
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous embedded URLs, with at least two pointing to suspicious domains ('druttle.ru' and 'fherixq.com'). The PDF structure and embedded content suggest it's part of a link farm or redirection scheme, likely intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://druttle.ru/strik?utm_term=warhammer+30k+horus+heresy+book+order PDF link annotation
    • http://fherixq.com/thug_kitchen_cookbook_commerciale70dt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492250/normal_60057a3dc2423.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419452/normal_601aa24387695.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379046/normal_5fd2fcb84c5e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444370/normal_5fe1c9bdef603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480142/normal_605f6ad13df12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445743/normal_5fef682042a70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473340/normal_5feea8d7c1bc1.pdfIn PDF document text
    • http://getliterate.online/semufutijogeponuxegelitim907v2.pdfIn PDF document text
    • http://disclosures.space/juviselo7ya8p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_6049c407beba9.pdfIn PDF document text
    • http://tryadasert.online/resumen_de_100_aos_de_soledad_en_inglesbewf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379385/normal_606145714163c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384461/normal_5fcbeb457bd65.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5598ced-aa7d-4db0-bbc9-08d861abe8bd/71884304357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89dfc56e-1ef9-4f7b-8fb1-f2a14a6aa213/falepiwomokewimobidadeto.pdfIn PDF document text
    • https://38c64f87-0506-4925-a3a1-425743e24937.filesusr.com/ugd/386d45_e3601257b3874ddaafb8ac907c1fa404.pdf?index=trueIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_06ccb79bef83485fb2d8d4b8046e8cdb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/67e1e7f2-3f8a-48aa-a60c-212507f4cf1b/jexukaraledil.pdfIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_766965108d0b42a4aba28c3de552b6df.pdf?index=trueIn PDF document text
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_fe50bd2d2f444215b11e4a7dc7e4d77b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d25d2c4-97ab-48e8-aaa1-bd48c0100202/powerline_adapters_slow_speed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e37c4cf-4c24-4979-9bcf-b823b60f7e0a/pdf_oxford_dictionary_english_to_urdu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/656574bf-873f-41de-b906-a6316252f174/reading_order_of_three_dark_crowns.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33e15c5e-1063-40ae-9d64-5712a6440daa/fe_reference_handbook_free.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00026598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26598 5656 bytes
SHA-256: 1e7558317f3841b1894875260509b6f1a27be1d89b5986c81834acd45fa453cc
font_01_sfnt_off000278b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x278B4 12580 bytes
SHA-256: 9fdf5c0f9ba7a5e5243973b3384fc14c41a5fe3e7c355e8d7092374a350abe8a
font_02_sfnt_off0002a2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A2D5 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90

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