Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd727f6275b42c4…

MALICIOUS

PDF

84.4 KB Created: 2021-03-02 23:40:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 4b9e799aca1c35f1982470ef0a05a422 SHA-1: 13caffd085a1cbb9cc025641b0e8e56d153d79e9 SHA-256: 8dd727f6275b42c47058d0bc87e1f8803b7882bbd841867b7434092af447db85
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a primary one pointing to a suspicious domain ('ponafet.ru') that is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to '50 shades of grey book 3' to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/award?keyword=50+shades+of+grey+synopsis+book+3 PDF link annotation
    • http://widalatipuna.22web.org/duzewurufutemodewodixegal.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/why_are_the_van_der_waals_constants_a_and_b_different_for_each_gas.pdfIn PDF document text
    • http://nutosuvitiraj.scienceontheweb.net/vivusa.pdfIn PDF document text
    • https://rasazumeg.weebly.com/uploads/1/3/1/4/131454762/2087772.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/future_perfect_continuous_tense_worksheet.pdfIn PDF document text
    • http://mujudesuxiropa.sportsontheweb.net/benowurer.pdfIn PDF document text
    • https://novatoful.weebly.com/uploads/1/3/0/9/130969934/2471767.pdfIn PDF document text
    • http://mebosopevux.iblogger.org/jupujetalopegabumut.pdfIn PDF document text
    • http://sibamonowoli.22web.org/69560817317.pdfIn PDF document text
    • http://fejukoturig.medianewsonline.com/the_little_brown_compact_handbook_9th_edition_download.pdfIn PDF document text
    • http://esagafow.fun/42131675747t0l7g.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://demiwadipojaz.epizy.com/12103640111.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/27579740107.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/munchkin_bottle_warmer_manual.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_off0000fef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF6 5620 bytes
SHA-256: 19b311250c87c06364868e8f7f7a9120fb9e5fd65b7fe5241a53e11e710f18b8
font_01_sfnt_off000111fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FE 10572 bytes
SHA-256: 6f27d145f1152946d7a2cbee58ab7f5fd2633668c97c3073e747b8e8a1fd4c49
font_02_sfnt_off00013642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13642 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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