Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8858dde82d0c5f3…

MALICIOUS

PDF

90.0 KB Created: 2021-02-28 18:09:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7db15211a9e8b71d292f7f9d0f507207 SHA-1: 0059da3ebc8ed10e61f14aab868ec21e32d2ff56 SHA-256: c8858dde82d0c5f32c2580c3dec36a8814bc74572fb440b22f1fe78897092e1a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and identified as a link farm, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate malicious content, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common technique to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://botokaw.ru/award?keyword=weber+grills+natural+gas PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421767/normal_6002ab4b18408.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/gdvxRld/35298307937.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/iogdhg9/95804070592.pdfIn PDF document text
    • https://cdn.sqhk.co/gituxogud/fhiHjid/slifer_the_sky_dragon_deck_duel_links_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/kUgfgdQ/62341712962.pdfIn PDF document text
    • http://moresukko.ru/gokikozakupqk74m.pdfIn PDF document text
    • https://cdn.sqhk.co/noxomosanena/tgckijf/segexa.pdfIn PDF document text
    • http://verification-help.com/c_3d_game_programming_tutorialpanqm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481400/normal_5ff36485c451d.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/dK8Piau/rush_copley_medical_group_mychart.pdfIn PDF document text
    • http://bestcreditcheck.info/rothys_shoe_size_guidezh2kd.pdfIn PDF document text
    • http://idealslimitalia-oficial.site/30290330690iqx7x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454995/normal_602d8e5829eac.pdfIn PDF document text
    • http://profaudit32.ru/android_jetpack_login_exampleds4o9.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzomorikat/wZyjiFV/zirowikoginolivezeletema.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459792/normal_5fe97296b00c4.pdfIn PDF document text
    • http://bigswinner.space/touch_of_class_bedding_comforters7223g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/97123242594.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/85451743989.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dcIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A5 5008 bytes
SHA-256: 62d8beb4587308b9f08d3e3bf5a56f72a3137282cc2d64a5b10e3f1c3546ffe4
font_01_sfnt_off000126ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CE 10772 bytes
SHA-256: 378e881020a11c115ff4fe1ee1171a1253ab5000507070c64ef978a8234c38aa
font_02_sfnt_off00014bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF3 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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