Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce70709f08ccb1cb…

MALICIOUS

PDF

73.4 KB Created: 2021-02-23 04:57:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8436c1ce77fdbe26f23601cc3944a52a SHA-1: f05e0afc8e498a9e000564404dbf490e8cc7b0dc SHA-256: ce70709f08ccb1cb42f333fdf8bf3acf24db06adcb03b826284b241e1d5b09c9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous embedded URLs, with at least one identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded content are consistent with attempts to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=eva+luna+book+cover PDF link annotation
    • http://giocodigital.website/919070610186uqq8.pdfIn PDF document text
    • http://claire-irk.ru/kennedy_center_millennium_stage_performance_schedulek24p7.pdfIn PDF document text
    • https://cdn.sqhk.co/mejiwimuza/lDfigQa/fonumo.pdfIn PDF document text
    • https://cdn.sqhk.co/mutukowure/Vifia6u/eating_green_potatoes_during_pregnancy.pdfIn PDF document text
    • https://cdn.sqhk.co/mugetawelumi/cVgdghC/dixomujipinanekir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420767/normal_5feea15a236b7.pdfIn PDF document text
    • http://doweryklkq.space/tiniruxikefebzylhk.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/happy_fall_yall_vertical_stenciln842q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479678/normal_6017b37d92f18.pdfIn PDF document text
    • http://dombitarf.ru/solving_equations_with_fractions_worksheetsazg1i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kalotiwinilobiw.epizy.com/govurowu.pdfIn PDF document text
    • http://jitimixilu.epizy.com/2018_cholesterol_guidelines_acc_aha.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/pokibafigu.pdfIn PDF document text
    • http://jojugabijogi.rf.gd/2005_malibu_starter_location.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_off0000e387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE387 4836 bytes
SHA-256: cbab7f8b0a80b52a2aa1c1fb9c0998d14daa44a70a01370036f5c3fde5bff755
font_01_sfnt_off0000f412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF412 10940 bytes
SHA-256: 8d2f24295001d18e203f3c90514dc0f2a6b40936f71c82c4ab068ab39c6489e5

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