Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7736244026a7fa7…

MALICIOUS

PDF

85.1 KB Created: 2021-03-14 12:02:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb0b74c4811fddc31a3fa4b0a290b97a SHA-1: 7c93c040b81136fdaedf448e9680e13df984be66 SHA-256: b7736244026a7fa756e869ff7938a586820272774a5f1a4a325e1aa1fea3578a
156 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 high likelihood of malicious intent. The file contains a large number of external links, suggesting it is part of a link farm or phishing operation. The embedded content, though heavily obfuscated, appears to be related to lures for external websites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/wix?keyword=matlab+signal+processing+toolbox
    • https://cdn.sqhk.co/rujiwujik/jbbhbjf/alien_shooter_2d_apk.pdf
    • http://nashremont.site/the_absolute_basics_of_the_christian_faithus94j.pdf
    • https://cdn.sqhk.co/tegiriwepaj/lFZjKgg/american_history_trivia.pdf
    • https://cdn-cms.f-static.net/uploads/4368504/normal_6036ca5878e6a.pdf
    • https://static.s123-cdn-static.com/uploads/4412396/normal_5fca11bfb461c.pdf
    • https://cdn-cms.f-static.net/uploads/4473056/normal_604ac7ac2b84e.pdf
    • https://cdn-cms.f-static.net/uploads/4420468/normal_602ad4203669a.pdf
    • https://cdn.sqhk.co/wetabupi/hibRd1k/tojowinebuwedenoki.pdf
    • https://cdn.sqhk.co/rozesivotix/hhih7K6/all_pixel_dungeon_games.pdf
    • http://com-connexion.xyz/the_blood_of_kings_a_new_interpretation_of_maya_artydswb.pdf
    • https://cdn-cms.f-static.net/uploads/4457582/normal_603fa4efd1f1d.pdf
    • http://mon-cmso.best/rapafubefironupogb12.pdf
    • https://cdn-cms.f-static.net/uploads/4481291/normal_604b7047c47fa.pdf
    • https://cdn.sqhk.co/mibemofega/jchfuhb/anime_guy_with_dead_fish_eyes.pdf
    • http://copriyghtconfirmed.com/2903911406wirju.pdf
    • https://cdn-cms.f-static.net/uploads/4401518/normal_6029cadc72833.pdf
    • https://static.s123-cdn-static.com/uploads/4371240/normal_5ff75c2c8de69.pdf
    • https://cdn-cms.f-static.net/uploads/4420745/normal_6035c56354b48.pdf
    • http://wei-nmvc.com/vunezegasawusaboq4g81.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bea00909-aa88-4d38-ac88-e56db460b486.filesusr.com/ugd/923104_3a63cd82ffb6400c971d1b897e0959b0.pdf?index=true
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_956b89683ca34d7e8591e63eaa868c75.pdf?index=true
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_debe69c3a5424ea5818d4e1a52777697.pdf?index=true
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_3d547f078ba3478fadea4913c4107b0a.pdf?index=true
    • http://baxuzotaxuli.epizy.com/budd_chiari_malformation_type_1.pdf
    • http://rupeguv.epizy.com/be_forward_toyota_hiace_van_manual.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c56.bin
5d59536cdd838de04304fd7fdf48c0069c2b510fd79d710fd5b800f116e67d8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C56 5312 bytes
font_01_sfnt_off00011e86.bin
9a8383d3a5d018fce57501959214514ea6727b089fecf0c1d0c51fd4b2698781		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E86 11828 bytes

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