Malicious PDF — malware analysis report

Static analysis result for SHA-256 13bf0198b4e46747…

MALICIOUS

PDF

73.8 KB Created: 2021-02-09 17:30:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cd247c9f5a8cdbe741786398e913e3eb SHA-1: 0b2e1d77ad873a211ed25d8a674c68e8ef4e362b SHA-256: 13bf0198b4e467475e2df110b3a7f933abf5a05def9d2c2d2ecb83aefe55a128
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable hosting and redirector infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious, suggesting a phishing or trojan distribution attempt. While no scripts were explicitly extracted, the nature of the embedded links strongly suggests a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=greeting+cards+online+template In PDF document text
    • http://wide-take.top/nuzewevasaxenos4okmd.pdfIn PDF document text
    • http://winoraama.space/dixovof25dj.pdfIn PDF document text
    • http://uber-global.com/donell_jones_torrenthkddf.pdfIn PDF document text
    • http://mbfsopg.com/kosaxepilagejalomedotuwoxkewio.pdfIn PDF document text
    • http://okstore.info/elemental_hero_deck_list06tc6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457592/normal_5fed0b9ed7eac.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/iHViu3q/picotin_18_etoupe.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/pjjJjfs/66611013749.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/57Jjhig/jasovomamovejebuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jigosip.epizy.com/nonstop_ball_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/27124764888.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/19353241888.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/felapolakodu.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_off0000e5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E2 5424 bytes
SHA-256: 64a5851b89ddc097efe04e505edfce85c40c154c7f41cf0abebb4ac6214a6801
font_01_sfnt_off0000f842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF842 9868 bytes
SHA-256: fae6bc6a5578a599e541f1a107516154f4a65c2a2966a2da72f0919e78d8108f

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