Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6004884664be0d7…

MALICIOUS

PDF

103.5 KB Created: 2021-03-23 17:11:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50f2a359179e909d7d29cf9bd03ed520 SHA-1: 95cf151d6411fca416265bbdef7698ae44a127ef SHA-256: c6004884664be0d7c1dc3e69e584e8d304f6f14c6a9937b003aabd5171368b69
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a large number of external links, particularly to domains like 'kuzutuzo.ru', strongly suggests a phishing or SEO spam campaign. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to redirect users to malicious content.

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://kuzutuzo.ru/wix?keyword=yuuya+kizami+x+reader
    • https://cdn-cms.f-static.net/uploads/4421624/normal_604cbbbecadf6.pdf
    • https://cdn.sqhk.co/valujoper/jcsjfRV/42317707442.pdf
    • https://cdn.sqhk.co/mivezifov/c7Mifjg/41488389727.pdf
    • https://cdn-cms.f-static.net/uploads/4486213/normal_603d61225ec04.pdf
    • https://cdn.sqhk.co/wajerewuwer/ehgOOig/wufikijororogipe.pdf
    • https://cdn.sqhk.co/zisuxemop/bjbpMii/wunerojeposulos.pdf
    • https://cdn-cms.f-static.net/uploads/4425507/normal_600a60fdc9f8c.pdf
    • https://cdn.sqhk.co/tigufarejeti/yidChfh/jekupuladezemepomutesiv.pdf
    • http://womenalikumat.22web.org/ludezulomomawolivon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_4e55a1d6f50c4fa996a8a3bf3f9a3e6e.pdf?index=true
    • https://f6b99bba-f064-431f-ab68-6eacb91b2703.filesusr.com/ugd/35e1ce_252d18af7fec479e80c53d9b62b9cdc2.pdf?index=true
    • https://6648aa49-deb3-4d6f-81a8-a63cc7a297fb.filesusr.com/ugd/38eac1_99bfa3ae1aab45528f282cf3dc9e264a.pdf?index=true
    • http://ziwilud.epizy.com/41803080357.pdf
    • http://verepuremi.rf.gd/a_summary_of_stephen_krashen_principles_and_practice_in_second_language_acquisition.pdf
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_95918f307ebb4894865ec7712e315764.pdf?index=true
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_811fbc6343514454b095e686a7b3edec.pdf?index=true
    • http://dekozosex.epizy.com/bwv_147_guitar.pdf
    • http://kamaxunavag.epizy.com/isms_27001_implementation_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014a11.bin
003280cd3824dfe1c262cceee73ded4880fa846d54bea5bdbe6e059b3834ae52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A11 4840 bytes
font_01_sfnt_off00015b19.bin
09c6530683e263765dca96b95da96af7efdf718d2938ac9b44eaa93e785a672c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15B19 5008 bytes
font_02_sfnt_off00016c25.bin
cfbe2ccc8f83528cd49c6727ab92f9c156776025ba4de88c3b46a2c492c614ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16C25 10908 bytes

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