Malicious PDF — malware analysis report

Static analysis result for SHA-256 60679751f465633f…

MALICIOUS

PDF

80.0 KB Created: 2021-02-24 03:06:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8ec105c6b68d70512990d7c7e71c9692 SHA-1: 47b5b10a1ffb4ddf640a0c20f62624da6f0dc821 SHA-256: 60679751f465633fe2d35b46729e72d2ca084cd58097a7807254e9da1f607ea3
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services and employing UTM parameters, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or engage in phishing. While no scripts were explicitly extracted, the nature of the link farm suggests it could be used to host malicious JavaScript or redirect to phishing pages.

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/123?utm_term=explica+la+relacion+que+existe+entre+la+teologia+y+filosofia+patristica PDF link annotation
    • https://cdn.sqhk.co/vivijuzajus/hgdEhdR/venub.pdfIn PDF document text
    • https://vemugalibi.weebly.com/uploads/1/3/4/4/134484787/83e2d3a97098f.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/jibc8ie/kikkerland_penguin_kitchen_timer.pdfIn PDF document text
    • http://tegor.xyz/21165720455ht2un.pdfIn PDF document text
    • https://cdn.sqhk.co/vozogekom/jdNhhgi/ombre_gel_manicure_near_me.pdfIn PDF document text
    • https://linikakisevokeg.weebly.com/uploads/1/3/6/0/136098208/fuwaxud_datusurujezej_goruzekesoxa_faxej.pdfIn PDF document text
    • https://sokuvefababadax.weebly.com/uploads/1/3/1/8/131856373/a467bef5d76e.pdfIn PDF document text
    • https://dusomekekonipa.weebly.com/uploads/1/3/4/5/134580960/makumiluweluk-jijanezukugid.pdfIn PDF document text
    • https://cdn.sqhk.co/maxanogefo/e1jfMhf/jewawo.pdfIn PDF document text
    • https://zamikife.weebly.com/uploads/1/3/1/6/131606416/zuboganinikilik_dokogep.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/Xgijiid/49079906463.pdfIn PDF document text
    • http://indonesia2health.online/frigidaire_parts_repair_clinicqsvrf.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/dpvpoig/99832419421.pdfIn PDF document text
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/sorotomivumonote.pdfIn PDF document text
    • https://cdn.sqhk.co/noretokujazo/0if6dji/m64_emulator_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/buzirigiti.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_off0000f5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D4 5436 bytes
SHA-256: 2dda570195f9ddea499aa827fdcd52e8e93318c3fd8e337434b88b6dd6b20858
font_01_sfnt_off00010875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10875 12284 bytes
SHA-256: 8d47649b737f746b84ad9ce4f71a0befa1ef9e5a23ed875a1f47e74f941cd28c

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