Malicious PDF — malware analysis report

Static analysis result for SHA-256 2334f3fdb2766e3b…

MALICIOUS

PDF

80.1 KB Created: 2021-03-17 03:22:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1622cbd530dba282f3d4f88de22f2fe1 SHA-1: 7c4ba5af032662a266b8cfd24134c45dc822f757 SHA-256: 2334f3fdb2766e3b5c152d42b8cc9c3d4bfbacb98ffa6ca7251989ea6ac18314
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting and link farms, suggesting a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://golowaki.ru/wix?keyword=computer+lab+links+games
    • https://static.s123-cdn-static.com/uploads/4495685/normal_6009a215ac279.pdf
    • http://sokuzise.iblogger.org/introductory_chemistry_essentials_answer_key.pdf
    • https://cdn-cms.f-static.net/uploads/4370263/normal_6035dc3f23b02.pdf
    • https://cdn-cms.f-static.net/uploads/4471085/normal_600f42a86af3c.pdf
    • https://cdn-cms.f-static.net/uploads/4527164/normal_602b91827d199.pdf
    • http://nexojofe.22web.org/emperor_clock_movement_repair.pdf
    • https://static.s123-cdn-static.com/uploads/4375073/normal_5fc5efb2110fc.pdf
    • https://mifakukataw.weebly.com/uploads/1/3/5/3/135349500/9920269.pdf
    • https://cdn-cms.f-static.net/uploads/4493227/normal_600e41c0f18da.pdf
    • https://static.s123-cdn-static.com/uploads/4448992/normal_5fef66842dc2e.pdf
    • http://rexuwoxaga.sportsontheweb.net/wuwazijoduruko.pdf
    • https://gejowarog.weebly.com/uploads/1/3/2/7/132740172/zetisizatudij.pdf
    • https://sezebotari.weebly.com/uploads/1/3/1/6/131636698/wupojefori.pdf
    • http://gejudoxe.mypressonline.com/how_to_fix_flashing_screen_on_lg_tv.pdf
    • https://fusopozosasotex.weebly.com/uploads/1/3/4/4/134477759/a1b2a074.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_663b480accb64841b068abdf09b482a2.pdf?index=true
    • http://fojosotum.myartsonline.com/is_pellet_stoves_worth_it.pdf
    • http://senesijosezetu.myartsonline.com/25932765607.pdf
    • http://vuruwabudakase.epizy.com/norobapopozasaxapisa.pdf
    • http://pejaxofupob.rf.gd/what_order_to_read_the_star_wars_comics.pdf
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_770d48769d364a0caedb71764dc8ce80.pdf?index=true
    • http://dixuzudes.epizy.com/fababutemulijosekijitafop.pdf
    • http://fomepufasele.atwebpages.com/encyclopedia_of_world_history_vol_iii.pdf
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_2db9045192ed4267b2cd949b3f75800e.pdf?index=true
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_227f4b5860874c0f868aad5e6fc2baa4.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_off0000eef0.bin
9b31b923c1a134f842b08eb61aab7b7b57fa5fed11f43e7a108c0d8df1140718		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF0 5248 bytes
font_01_sfnt_off000100b1.bin
7786f238e9f624e685650d0e5c4c22f2cab3c797c5c643011258455c7d73be18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100B1 10612 bytes
font_02_sfnt_off00012510.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12510 4324 bytes

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