Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b814ab8d7ac982…

MALICIOUS

PDF

88.9 KB Created: 2021-05-05 12:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61766b52058c5f8a615e83a885c830e1 SHA-1: bb7c496fc0eee81fa79e66051612445f7cf4109e SHA-256: f6b814ab8d7ac982f1729c5d125591e7022c003d8f8e6ff518e0da68c8d9ca0d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://kuzutuzo.ru/strik?utm_term=how+to+fix+pilot+light+on+oven
    • https://zububeto.weebly.com/uploads/1/3/6/0/136082076/telude.pdf
    • http://xevigukek.iblogger.org/brigandine_grand_edition_guide.pdf
    • http://selozufuwadapuw.66ghz.com/charley_belcher_contact_information.pdf
    • https://rofosuvobatijam.weebly.com/uploads/1/3/4/6/134661532/938840.pdf
    • https://judenebubiz.weebly.com/uploads/1/3/4/6/134656374/2651379.pdf
    • http://bukudix.getenjoyment.net/9002131897.pdf
    • https://dinoromakutaxe.weebly.com/uploads/1/3/4/4/134479472/2801730.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0bc2ebcf-5b85-435c-8290-6c6350a165f2.filesusr.com/ugd/ee98f5_dc23603493744ddfbf6f2e89c0901204.pdf?index=true
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_fa14710f5cf64fe38e59d12010907ad6.pdf?index=true
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_241a5cde2e8d4b0e89cb6f1c442769b4.pdf?index=true
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_77192d4768184a4f8d882a162d478ad0.pdf?index=true
    • http://wirirarosutuki.epizy.com/napoli_calcio_ultimissime_formazione.pdf
    • https://f43304fd-85e4-489a-8612-81977e01be4a.filesusr.com/ugd/b6f504_24047a0f5b834228af2a9e809c43d627.pdf?index=true
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_fd1a609fbd40472888278531b5c06117.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e22.bin
737db4939d60c0a6f9d019256da2183d135039d4f223db1ad30c34346c0bff36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E22 4860 bytes
font_01_sfnt_off00012ed1.bin
d64d2db7e6c7261873f0a7347322f32e625da742bb8361b6a913a92f279e63cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED1 11624 bytes

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