Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cdcbd7729e440e6…

MALICIOUS

PDF

75.3 KB Created: 2021-03-23 15:57:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3d10aa9e8fd3902f088be607b9793d6 SHA-1: 8310c0220a24ef8083b6a6e04314b920142d7901 SHA-256: 2cdcbd7729e440e6a58632fdce5fbac293633d025f3f7c684cf41b6dc8befe04
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 PDF contains a large number of external links, a technique often used for SEO spam or to distribute further malware. One of the embedded URLs, 'https://botokaw.ru/123?utm_term=toyota+yaris+hybrid+2014+manual+pdf', suggests a lure to download a manual, which is a common phishing tactic. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

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://botokaw.ru/123?utm_term=toyota+yaris+hybrid+2014+manual+pdf
    • https://cdn.sqhk.co/filemowa/Ojeiigd/26307917335.pdf
    • https://static.s123-cdn-static.com/uploads/4527108/normal_600902e7217cf.pdf
    • https://static.s123-cdn-static.com/uploads/4423427/normal_5fc63b81733fc.pdf
    • https://static.s123-cdn-static.com/uploads/4418558/normal_5fdff1621550b.pdf
    • https://static.s123-cdn-static.com/uploads/4456122/normal_5fe1b5a6c2e62.pdf
    • https://cdn.sqhk.co/pofevadamem/igfKgcN/96139758518.pdf
    • https://static.s123-cdn-static.com/uploads/4423195/normal_6006e3872e1e9.pdf
    • http://kudukudimox.sportsontheweb.net/how_much_does_a_mustang_shelby_gt500_cost.pdf
    • https://static.s123-cdn-static.com/uploads/4461204/normal_5fed7250e6520.pdf
    • https://static.s123-cdn-static.com/uploads/4417806/normal_5fe0a59c4db5b.pdf
    • https://static.s123-cdn-static.com/uploads/4463010/normal_5ffddbea3cf49.pdf
    • https://cdn.sqhk.co/xinefegepe/ajb3Bhb/police_auctions_texas.pdf
    • https://cdn-cms.f-static.net/uploads/4390374/normal_601158828ac80.pdf
    • http://nanamojuvimujo.medianewsonline.com/34003109812.pdf
    • https://cdn-cms.f-static.net/uploads/4379610/normal_5fe6e6b74b910.pdf
    • https://cdn.sqhk.co/burexewejam/Rjfiigc/piano_lessons_near_me_cost.pdf
    • https://static.s123-cdn-static.com/uploads/4475872/normal_6007c765b923e.pdf
    • https://static.s123-cdn-static.com/uploads/4449419/normal_5fc92a1d4ec81.pdf
    • https://cdn-cms.f-static.net/uploads/4410194/normal_5fd7a576773bd.pdf
    • https://cdn.sqhk.co/wikikifigas/nVLWM7s/naduzuzulawuxuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://63150c49-9e7f-4923-bc7a-1e4049050ce6.filesusr.com/ugd/cba449_4ccf21ac669040dfb04a06b25787da2d.pdf?index=true
    • http://zimopup.myartsonline.com/nuluforawujofar.pdf
    • https://f6b99bba-f064-431f-ab68-6eacb91b2703.filesusr.com/ugd/35e1ce_5dda0266230f41b5bc19689fc6a32c8f.pdf?index=true
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_427da5604c6d41dc9eee5b0b774af8e3.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7c0.bin
efe1777bd2aea15f3c63284efe0cf1cac13b24dea9f137e1c3bafdb1bf7c7cff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C0 5884 bytes
font_01_sfnt_off0000fba8.bin
f967806311661227f2d30589c4b65861daa5ce4eac7faa3ebec7511c938ba551		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 10516 bytes

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