Malicious PDF — malware analysis report

Static analysis result for SHA-256 cffcaee8dfffc3b4…

MALICIOUS

PDF

77.0 KB Created: 2021-03-21 21:24:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ff8bc999e310fba519703a052fe0046a SHA-1: f4cec33ca37bfe63b1725665af4055bb1c14b04f SHA-256: cffcaee8dfffc3b480e052965be664a45a346974cbc8c8d2568ae337771cc54d
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious sites.

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://midufefew.ru/award?keyword=wicked+good+ketogenic+diet+cookbook+pdf PDF link annotation
    • http://canonsburglake.com/52512008176869ba.pdfIn PDF document text
    • http://kungfumalibu.com/2419081672kkljg.pdfIn PDF document text
    • http://sosed.market/zubewowozujurabodamofuletyanjd.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/resumen_corto_de_la_obra_los_crimenes_de_la_calle_morgue_resumen.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/ajfjea1/21390160038.pdfIn PDF document text
    • https://cdn.sqhk.co/pabefidinaz/Mhb3bii/steel_pulse_true_democracy_zip_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nomevagume/dqiaQgc/fogozomujefaxapu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_0ad3e2136ea14dcc8e5ee13482f138f4.pdf?index=trueIn PDF document text
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_bf9b951b47544b489d2630b41872cf96.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2415d924-bcd3-4939-92b1-0093eabb05dd/apc_back-ups_550_be550g_battery.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/black_and_decker_jigsaw_js660_parts.pdfIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_cd630cb452d94c0fa3773e7dc918807d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3550152e-b78c-4f36-b1a4-aa39ee8405f3/927738158.pdfIn PDF document text
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_6889da559efb49e999a055fa2c486347.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisute/87199914716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0853c7a6-4e4d-4f3b-b436-e8644b633984/93950855636.pdfIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_2dd499a589034333b3cb7101f61f0cb4.pdf?index=trueIn PDF document text
    • http://gitojaxekeveki.onlinewebshop.net/19495193957.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD3 5024 bytes
SHA-256: 824f3215fe9f9bad24ef35b1dc06c3a892cddde71e405ee1213677cfefbf4a76
font_01_sfnt_off0001011d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011D 11148 bytes
SHA-256: a58c5516666d81647add2a889d3259a2302316b6aa3131ef437eb23905203729

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