Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1cd3e0f01fffc74…

MALICIOUS

PDF

81.3 KB Created: 2021-01-26 01:47:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: be908117e053479263ecd9ff151b518a SHA-1: 48aa0e02fa37adfc0b91e3768368626514df2e92 SHA-256: d1cd3e0f01fffc74e299f8602d8e89cef34bfa780007887e95b78bafa71b9174
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 pointing to disposable hosting services, indicating a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jottigo.ru/123?utm_term=andrzej+sapkowski+net+worth+2019 PDF link annotation
    • https://cdn.sqhk.co/murevexi/hACYMjd/razifebovekatareratefo.pdfIn PDF document text
    • https://cdn.sqhk.co/nedupugifuka/iegeobG/32666459429.pdfIn PDF document text
    • http://testrun.ru/bixidobirevegadiribarokocjpqs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_600aec4db2605.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476275/normal_5fd61315ea60d.pdfIn PDF document text
    • https://xanerenidijuv.weebly.com/uploads/1/3/0/7/130739333/3ef54e1.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/iiWc7gd/mcintosh_lake_trail.pdfIn PDF document text
    • https://zuvubexusemeto.weebly.com/uploads/1/3/4/3/134373725/9771401.pdfIn PDF document text
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/2858338.pdfIn PDF document text
    • http://reduslim-sito.site/wegilubgko9.pdfIn PDF document text
    • https://cdn.sqhk.co/sezepemanu/hdoyVHx/netifewoxus.pdfIn PDF document text
    • https://cdn.sqhk.co/bixatavafut/OjfQzVI/13764580484.pdfIn PDF document text
    • https://cdn.sqhk.co/sejiragidu/cvxggD5/mobile_homes_for_sale_ocoee_fl.pdfIn PDF document text
    • http://iranianvc.com/blood_pressure_medications_namess6hzm.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/G9ihA2E/nordic_naturals_ultimate_omega_junior_review.pdfIn PDF document text
    • http://skout.tech/49204324444vh5ax.pdfIn PDF document text
    • https://cdn.sqhk.co/sutadejuna/TCbhcja/votokaladojijek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383128/normal_600b4d25ca564.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 5768 bytes
SHA-256: 66b523224715cf4d33fd495b081728f3ff14e2eaf91d7af604274fb2d7c5c488
font_01_sfnt_off00010a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1D 14352 bytes
SHA-256: f613bd033fb84accdd5842efc76c6c575104eb3ca240a1423af278dc002793cd

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