Malicious PDF — malware analysis report

Static analysis result for SHA-256 fefd2e997a4d5a09…

MALICIOUS

PDF

68.4 KB Created: 2021-02-28 18:29:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 460ec7201d56b81cf9e6c41789083040 SHA-1: 1ddc6294f7c6c4fffc54883cda8354a9b591a07c SHA-256: fefd2e997a4d5a09907195b2f0105c3eb240b274f03a96e131d1e71d096cfa93
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs pointing to disposable domains, indicating a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to redirect users to potentially harmful content. No scripts were extracted, but the presence of multiple external links is a strong indicator of malicious intent.

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://jottigo.ru/award?keyword=the+bane+chronicles+audiobook+free PDF link annotation
    • http://burivuvuju.medianewsonline.com/57468027636.pdfIn PDF document text
    • http://simopuvoramawu.mywebcommunity.org/gonoliwefotilat.pdfIn PDF document text
    • http://guitar.su/nordictrack_1750_treadmill_instructionsqhat0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374689/normal_603a47f75b669.pdfIn PDF document text
    • http://evilcheats.fun/beach_buggy_racing_hack_apkfv9ps.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/upcoming_marvel_films_release_dates.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452385/normal_60088e6a58299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405185/normal_60226c7d3004d.pdfIn PDF document text
    • http://fuvesozufinefi.medianewsonline.com/68988198273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425727/normal_601cf7a0cfceb.pdfIn PDF document text
    • http://septiki-rf.website/2010_toyota_corolla_repair_manual_pdy86cp.pdfIn PDF document text
    • http://arfeshome.com/australian_visa_application_form_1419_sampleo9443.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/lange_psychiatry_10th.pdfIn PDF document text
    • http://giocodigital.space/ashrae_2012_duct_fitting_databasepanla.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/paxevug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nisetekotixob.myartsonline.com/45972007292.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_off0000cf44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF44 5264 bytes
SHA-256: a84ed54352df035160c0ddf7209846a22af422790a105ed9b12387f41e20c5ac
font_01_sfnt_off0000e11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11C 10300 bytes
SHA-256: a8788b2ddcdebdae5a9cab8cd2e38cf5c1ef9f5241699417398d81748a30a184

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