Malicious PDF — malware analysis report

Static analysis result for SHA-256 8baa0cea64b840aa…

MALICIOUS

PDF

69.1 KB Created: 2021-02-19 02:41:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d29f2390dcee428b96d664bed33a6fd2 SHA-1: 634fab83ac23e855cd01efa21851ff7bff6af58a SHA-256: 8baa0cea64b840aaa2e45c56fe50ca3bad1aa3a925d1f320f4cb5437b849bd68
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using small PDFs with many links on disposable hosting, often associated with malicious campaigns. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics strongly suggest the PDF is intended to redirect users to malicious sites.

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
  • 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://seumenha.ru/123?utm_term=firex+smoke+alarm+wired PDF link annotation
    • https://mubasaji.weebly.com/uploads/1/3/4/8/134846322/rusividunozilun-sojuzodiw-lasarus-pitumexeleso.pdfIn PDF document text
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/85e37690.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378621/normal_5ff8c5bfb68b5.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/lafusemosegofobusezetm9o3o.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/ifgj4DV/60918898663.pdfIn PDF document text
    • https://cdn.sqhk.co/rorifugera/ifjjgdU/15766995230.pdfIn PDF document text
    • https://cdn.sqhk.co/bexamajuw/Djggcij/nba_2k20_soundtrack_apple_music.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwipabobatu/ehRgfia/totally_accurate_battle_simulator_free_online_game.pdfIn PDF document text
    • https://wirolarem.weebly.com/uploads/1/3/1/6/131636642/083c7c99f3662.pdfIn PDF document text
    • http://bigwin-1xbet.fun/30793248373dr8jy.pdfIn PDF document text
    • https://jowetirepenu.weebly.com/uploads/1/3/1/3/131383619/doziwesowufiw-xofir.pdfIn PDF document text
    • http://tlgfree.xyz/reviews_heartland_sheets7dwt7.pdfIn PDF document text
    • http://bestplacefor.rest/balixegosononizuzewasuan9p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464055/normal_5fef88c30e10d.pdfIn PDF document text
    • https://zabaparadasikid.weebly.com/uploads/1/3/4/3/134317604/guzexupojeperaj_winerosuk_zikopabifirilu_waxedazumo.pdfIn PDF document text
    • https://tutonaxubetu.weebly.com/uploads/1/3/5/2/135296536/8c65409.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/farowug/21806072668.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/california_corporate_nol_carryback_form.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/como_eliminar_alacranes_de_forma_natural.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/newsletter_templates_free_elementary_teachers.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_off0000d2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BE 5148 bytes
SHA-256: 69d84672a4ef57bcb15b4dc2b4535709f5dd979ad616a3c9041fa596bba5f9dc
font_01_sfnt_off0000e443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE443 10324 bytes
SHA-256: 23d47d0790cadc8a4539bf9dab7e331425f78cd98a8b265772b0d2bc2f02ea39

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