Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e2f619c170d7e93…

MALICIOUS

PDF

73.5 KB Created: 2021-02-25 08:13:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d25cd17f938ab6d340623d5d6f47fa88 SHA-1: 25fb3529ed414b0ea1affe719391aa90ab91ed56 SHA-256: 7e2f619c170d7e933f88cc020ca8c69f88ee7b9ca7fd9c04c3ff92216d2e7114
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a prominent one pointing to 'jacksth.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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 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://jacksth.ru/123?utm_term=what+are+the+five+project+management+processes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461234/normal_600e61025a0e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483349/normal_6014bb0673d96.pdfIn PDF document text
    • https://cdn.sqhk.co/xiditado/bhhQigq/gavifegusetanepafatij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495058/normal_5fddafb15f33e.pdfIn PDF document text
    • http://evilcheats.fun/ford_mustang_gt_engine_price3qrib.pdfIn PDF document text
    • http://drive4mclaneaustell.com/piwibesajekezi09wgm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417222/normal_600e55ef0ae09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489245/normal_5ff56531297c3.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/fathers_and_sons_volvo_west_springfield_massachusetts.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/z8P1Bib/37625124568.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388612/normal_6035946462650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454422/normal_60216aad5f51a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414514/normal_5fdd8f24abc33.pdfIn PDF document text
    • http://tesigelilojir.iblogger.org/kolovik.pdfIn PDF document text
    • https://cdn.sqhk.co/rosisole/gjhhy0a/download_larva_heroes_lavengers_mod_apk_terbaru.pdfIn PDF document text
    • http://zoo-taxi.site/gixupebowivezu0yh7l.pdfIn PDF document text
    • http://punejew.mygamesonline.org/99022988587.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bizepusozuj.epizy.com/chiari_malformation_type_1_diagnosis.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_off0000e246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 5544 bytes
SHA-256: 2cf74f220acc68f7b4cfd9c8b678da864a07dda05b880bc0137587b96e295d93
font_01_sfnt_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 10520 bytes
SHA-256: f8d6a9bd8b7cbd5542d89e6fada01048fb30b75d7e510282f8061d4224bf9bea

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