Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bc6f3f0a80d76d…

MALICIOUS

PDF

84.5 KB Created: 2021-02-12 07:20:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b02fd2abda18acc50b0d7da92d280ee0 SHA-1: 1114f33d9a13d46261cd9f1c37eb4cbc3c89b4ed SHA-256: 18bc6f3f0a80d76d821907e588a5fb20d6bf37510a4dfc426415828cd78b0228
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, many of which are disguised as book downloads, suggesting a link farm or phishing attempt. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious sites for further exploitation.

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://bologen.ru/wix?keyword=manny+khoshbin+book+pdf
    • https://cdn-cms.f-static.net/uploads/4369185/normal_60208d480bd22.pdf
    • https://cdn.sqhk.co/tixunudixa/Nighdig/cube_dice_pattern.pdf
    • https://cdn.sqhk.co/gupetipek/jeji7mB/farm_town_cartoon_story_mod_download.pdf
    • http://brumbum6.xyz/81805859964geq11.pdf
    • https://cdn.sqhk.co/muvotugi/jTif6gK/gotefu.pdf
    • https://static.s123-cdn-static.com/uploads/4446773/normal_5ffbd8dd4990b.pdf
    • https://cdn.sqhk.co/vujenibolo/liehhnh/street_fighting_2_kung_fu_mod_apk_download.pdf
    • https://cdn-cms.f-static.net/uploads/4380863/normal_5fda1c359415e.pdf
    • https://balexasureg.weebly.com/uploads/1/3/0/8/130874281/tefipudegunotada.pdf
    • https://cdn.sqhk.co/wazikunal/cjcpijQ/18485694501.pdf
    • https://cdn.sqhk.co/zerurukoraju/fjbhgct/daxutitizigirinavakizutaz.pdf
    • https://cdn.sqhk.co/gavezexu/hfjbgeZ/pc_games_more_wow_classic_sonderheft.pdf
    • https://gofupadosu.weebly.com/uploads/1/3/4/8/134853885/ea932c7616443ad.pdf
    • https://cdn.sqhk.co/satidaruxami/gcRMgcJ/xexodudunaxavu.pdf
    • https://static.s123-cdn-static.com/uploads/4449009/normal_5fe49dc3de15f.pdf
    • https://static.s123-cdn-static.com/uploads/4403127/normal_5ff95d98e681d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00010c12.bin
5079bb5351c4353e14782c98a7f2001a99bf57395ac15941e0c2b8d7bea3d3a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C12 5312 bytes
font_01_sfnt_off00011e32.bin
7b6fb428a13b3fd9ab3bcfc4150346c44e65a7ee926a3b408cb13558faa17dd6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E32 11348 bytes