Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf0ffc51140095c…

MALICIOUS

PDF

76.1 KB Created: 2021-02-21 22:37:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2a84096dab49d5be19396b0670b6c2e9 SHA-1: a3c29799906abb242405051ef3803e76a9036004 SHA-256: 6cf0ffc51140095c7f9e1329c67adf1241fe2544a86b8f02d30c87899426cc59
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the presence of external URIs and the overall structure point towards a social engineering attack to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=bionic+turtle+frm+part+1+practice+questions PDF link annotation
    • http://remontnatali.ru/vutijexawenugewetonarc2t6b.pdfIn PDF document text
    • http://kowesaxulenim.22web.org/wixomoguwi.pdfIn PDF document text
    • http://autobaff.xyz/856187627540g1p4.pdfIn PDF document text
    • http://babudategajuzul.iblogger.org/goxusasegi.pdfIn PDF document text
    • https://cdn.sqhk.co/wujamufaw/hgsiVwN/18719609136.pdfIn PDF document text
    • http://yeswins.space/jigugoparakuvumutabuz7k3y.pdfIn PDF document text
    • http://littlenat.space/mentalist_season_5_subtitlesavph5.pdfIn PDF document text
    • http://luxshop21.site/quran_surah_list_with_english_meaningbcjcs.pdfIn PDF document text
    • http://parhelifrl.space/the_history_of_middle-earth_indexx0f00.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jumejivoreka.rf.gd/2253243199.pdfIn PDF document text
    • http://lujuxug.epizy.com/48416047902.pdfIn PDF document text
    • http://fositelorefux.epizy.com/xamuxuzejaz.pdfIn PDF document text
    • http://navefifidarep.epizy.com/51026493431.pdfIn PDF document text
    • http://zuwarikufaz.epizy.com/napiwemizax.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD724 5388 bytes
SHA-256: f873b190112c25667e8a30d0bd4d41086630d9209c7b30a7f77a7fe54fe3def0
font_01_sfnt_off0000e96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96B 10220 bytes
SHA-256: b139bd29e06d74979eff3b113ce467817144f7382a6bed8e563ee0e2e30f3a7e
font_02_sfnt_off00010c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C80 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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