Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb2fc527fddf8f6…

MALICIOUS

PDF

84.4 KB Created: 2021-03-05 08:12:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 33837a8133451aa69857eb05fc99350d SHA-1: bbb7ca4330419d08b222eec3b38d266bb874c0ea SHA-256: abb2fc527fddf8f68ae84258b2b8e4196b78a016e3a511b90e1960053b60f2e4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xajibur.ru/strik?utm_term=hexacopter+jjrc+h20 PDF link annotation
    • https://cdn.sqhk.co/kapideto/PhiEWgY/64977976205.pdfIn PDF document text
    • https://cdn.sqhk.co/ninujamezol/aVjgMXA/37147651956.pdfIn PDF document text
    • https://cdn.sqhk.co/jugemito/tThi40r/lazadatazunopujimile.pdfIn PDF document text
    • http://item-mask.top/25626869475rymkf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416322/normal_5ff08ecde1a77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478670/normal_5fd62fc8bdabe.pdfIn PDF document text
    • http://complerbnp.com/guwaviziwevaobis4.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/csjaiah/universal_remotes_for_samsung_smart_tv.pdfIn PDF document text
    • http://alkim.xyz/2393673452hgr18.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuzasana/lnha3dS/43089779113.pdfIn PDF document text
    • http://trikolor.site/lozuboxuxerunorubovkmo4u.pdfIn PDF document text
    • http://postel-na-zakaz.ru/wunder_von_bern_torwartulvfw.pdfIn PDF document text
    • http://fifamarketbot.com/62769084394fyrcx.pdfIn PDF document text
    • http://apple-fruit.space/687539905113f3dy.pdfIn PDF document text
    • https://cdn.sqhk.co/pisomuma/gfihhh8/21736915823.pdfIn PDF document text
    • https://cdn.sqhk.co/suvotoruwot/7SbIjjQ/80668058097.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382209/normal_600f9cfa69108.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eab471ca-0d50-427b-9e4c-d7116874192f/the_distance_between_us_chapter_3_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba8347ec-c4b1-4c1a-b998-ed416cfa5509/53310547710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a3e8778-53e3-4e1c-998f-33c05eca4745/what_are_the_statutes_of_limitations_in_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e71a51a-622c-406f-91d3-f62d44442213/38768263673.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7e33231-4ba2-4f81-8790-a8e2579dee24/84535224266.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
    • 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_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 5188 bytes
SHA-256: 2c045e67c115228b76620288a3414b8617af9ef923478fa0a13986bcee9eb12b
font_01_sfnt_off00010a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A83 10624 bytes
SHA-256: 283317214fc696dbd2e08abfab133d26117af17e5d8f8a6a082b04a785f9a0f4
font_02_sfnt_off00012ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF1 16164 bytes
SHA-256: 3afbc95f4a2677bf4c8b77bd7df62e4dbeb651db4b5e482cf97b58e472170d58

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