Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb68191b65a795d…

MALICIOUS

PDF

84.5 KB Created: 2021-03-28 20:41:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ecf9ac61a8e550635eb79562ca94c18 SHA-1: dbb9b56036ca9bb735f87cf76aeded2c98ebc942 SHA-256: fdb68191b65a795dde01d11fd2fafdd7eec8e774d7d129db3af7b9e4eec44881
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'algebra textbook free pdf'. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate an attempt to redirect users to potentially malicious websites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/award?keyword=algebra+textbook+free+pdf
    • https://cdn.sqhk.co/jeforije/co7jihb/cute_drawings_for_boyfriend_easy.pdf
    • https://cdn.sqhk.co/lesepivir/Iih9TXu/puzzle_test_questions_and_answers.pdf
    • https://static.s123-cdn-static.com/uploads/4387226/normal_5ff7ae6a7ec96.pdf
    • https://cdn.sqhk.co/vuxijavapul/fjbkLFy/robizanatutov.pdf
    • https://cdn.sqhk.co/mezutorixo/fdlAVie/exception_handling_in_c_tutorial.pdf
    • https://cdn.sqhk.co/budajawisore/Xhdgdt4/did_you_know_facts_about_food_waste.pdf
    • https://cdn.sqhk.co/vekuperik/Jgoiihj/copper_scrap_prices_york_pa.pdf
    • https://cdn.sqhk.co/bebiwamulanu/icFhia6/fumonozodagonudelefe.pdf
    • https://cdn.sqhk.co/fulaxanew/wUJjdSz/eva_pope_twins.pdf
    • https://cdn-cms.f-static.net/uploads/4477878/normal_601a16067ee42.pdf
    • http://meinekarten.best/3461153679fitvf.pdf
    • https://cdn-cms.f-static.net/uploads/4476270/normal_5fd64d0dd5799.pdf
    • https://cdn.sqhk.co/toromerepowa/cgcicle/roduwegemis.pdf
    • https://cdn.sqhk.co/daxutoxod/jjmigii/lagu_arlida_putri_karna_su_sayang.pdf
    • http://mini-cam-v2.club/should_a_soccer_player_lift_weightsic1vm.pdf
    • https://cdn.sqhk.co/pesamelez/QcBsNij/tuzesub.pdf
    • https://static.s123-cdn-static.com/uploads/4376103/normal_600417d7c80af.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://246406bc-bb0d-4f29-baed-d8a6153a9543.filesusr.com/ugd/3ddeef_6da80a1974f142769f6b2050feb34332.pdf?index=true
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_7f3ae114b3cb47de9082f45c7584ce7f.pdf?index=true
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_bdeae624cbf94e378be1ab76c70696c9.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101e5.bin
21251d734626958d314f65277662ba865af7d8ca5ded100299d4221ae431f4e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101E5 4928 bytes
font_01_sfnt_off000112bf.bin
e39c093e8a0ad5623c4a51610f3d72c3194949f410c085788cb5abc3ab825454		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112BF 10388 bytes
font_02_sfnt_off00013645.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13645 4324 bytes

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