Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e4367aa6d20c09…

MALICIOUS

PDF

81.1 KB Created: 2021-03-04 05:29:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9510f458b38aa3bac0ab02b87225111e SHA-1: d09a43a1b1f7f3653da0c06dcf4979bebdc178dc SHA-256: 57e4367aa6d20c09d45c6f1a37febaa85c8d5360d8124fc1f2938702e2e47da0
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to "Tim roughgarden algorithms illuminated part 3", likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/wb?keyword=tim%20roughgarden%20algorithms%20illuminated%20part%203 PDF link annotation
    • http://varnisvakq.ru/building_maintenance_technician_test_questions_and_answers81a8f.pdfIn PDF document text
    • https://cdn.sqhk.co/xiponamoribo/XNjfihv/lojinupagujabebupevutif.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/jfpXdjg/vifekilep.pdfIn PDF document text
    • http://siteznakomstv69.space/best_material_for_gmat_preparation8hyem.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/L7ge5gf/mowonakomotobuk.pdfIn PDF document text
    • https://cdn.sqhk.co/puwidebudojo/G6mjcRl/luneragoxiwapitanam.pdfIn PDF document text
    • http://fridgeservice.ru/minecraft_potions_guidevlnd1.pdfIn PDF document text
    • http://kimokabif.medianewsonline.com/how_to_know_sentence_structure.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/eggpYjd/zombie_2_costumes_willa.pdfIn PDF document text
    • http://mpvideo.org/mugonolorejitanp24ln.pdfIn PDF document text
    • http://carbags.site/mijomarubaroraleqqvas.pdfIn PDF document text
    • http://ilkertr.shop/japirumef1rdc.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/bupesejirijejus/wamagivu.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_off0000fd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0E 5488 bytes
SHA-256: 4bb02ba3d470730de56d581f75f3130e6539101d24edf2a87a378e074b868b36
font_01_sfnt_off00010f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8D 11616 bytes
SHA-256: 3855d2e6f17fc7ecaa9bdea6ff017e7f1a95bd7f9de25ba47e7402a30173e2b7

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