Malicious PDF — malware analysis report

Static analysis result for SHA-256 936c3c5ed2bc8ade…

MALICIOUS

PDF

78.3 KB Created: 2021-03-13 16:40:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bf5b5bf31abd3f769137f4c4c69bfe58 SHA-1: 0e24023e7cad51ad0e02c5e8bf1ae0252b7d6e8f SHA-256: 936c3c5ed2bc8ade611c877c0537be462bc92f2bb030a18a346f06aa5eaa19fd
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially malicious content, possibly for SEO manipulation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://seumenha.ru/wix?keyword=top+organic+keto PDF link annotation
    • https://levevuwakute.weebly.com/uploads/1/3/4/9/134904524/rirazokeb-sizumujepene-zonem-pabipinol.pdfIn PDF document text
    • http://babitilakibo.mywebcommunity.org/sogur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470832/normal_5fe3e8a84988f.pdfIn PDF document text
    • https://cdn.sqhk.co/miburixegapu/jeMjiur/xenefosedidinizuw.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwuzasemifo/heji0ia/online_photo_editor_pixlr_download.pdfIn PDF document text
    • http://sewawena.scienceontheweb.net/15533785193.pdfIn PDF document text
    • https://vetafewilede.weebly.com/uploads/1/3/1/4/131408572/befivuvenuna.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404113/normal_5ffa7ae0d93fc.pdfIn PDF document text
    • https://cdn.sqhk.co/naxisedomak/fhf1gfT/ben_10_alien_experience_download.pdfIn PDF document text
    • https://topudikuwem.weebly.com/uploads/1/3/4/0/134042537/xilezipu_nodisidapon_dadida_pagitedo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1794ee33-230d-455b-98b1-84d48067edce.filesusr.com/ugd/551769_f79cf0d67b174b6fa484d0954dc1283d.pdf?index=trueIn PDF document text
    • https://685e81b7-c2be-4174-b40b-5274ee657e31.filesusr.com/ugd/e33828_d4264a5dd7264a33b3a17c9316091084.pdf?index=trueIn PDF document text
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_4e0245e32ccc442d8ba8f20dbccbdc26.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/chita_animal_information_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/agyo_privacy.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/free_professional_powerpoint_templates_design.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_93ecfb4120284a84a7593145587b3a3e.pdf?index=trueIn 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_off0000f662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF662 4904 bytes
SHA-256: 04588f126e2186d808d992b2c42cd88cf63de61963c4ed11e39ccd9e7e7025b7
font_01_sfnt_off0001072a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072A 10988 bytes
SHA-256: b69f883fed5f3a11fff77141cbdb9dae83602bd8fcccbd09e0f2e18399168e0c

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