Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7da7a3b8dd5cbfc…

MALICIOUS

PDF

86.0 KB Created: 2021-02-18 09:41:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 517a7bfff5a963db05347a64acccbc28 SHA-1: d7a9230f4779f58e75a9f6061b92ad0fc5ab6ff1 SHA-256: f7da7a3b8dd5cbfc98f8ebd25ce1e3119b5ff572c331e5027285a5174c5afd48
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or redirection mechanism to malicious sites. The document body, though heavily obfuscated, contains keywords related to 'motherboard bios' and 'wkhtmltopdf', indicating a lure for technical information that likely leads 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 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.
  • 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://maypoin.ru/strik?utm_term=g43t-dm1+v+a00+motherboard+bios PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4484376/normal_5fed7400bc0c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485435/normal_5fc591757495d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421640/normal_5fd9199d3d342.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/3ief9ij/tagabapap.pdfIn PDF document text
    • https://cdn.sqhk.co/salobosemiv/6XVjfXk/best_craft_beers_australia_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480581/normal_602bf52a176ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456166/normal_5fd13906f1025.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408190/normal_600288f2e8cd1.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/hiMicuQ/60962944171.pdfIn PDF document text
    • http://classkaod.ru/womadalasozowejotatujudyh97v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382621/normal_5fefaa04e2e02.pdfIn PDF document text
    • https://cdn.sqhk.co/jipuxoxukul/jcgdeGA/foosball_table_game_stores.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/jesmhfT/stage_modern_furniture_miami.pdfIn PDF document text
    • https://kenazago.weebly.com/uploads/1/3/1/0/131070597/4bdf89caa50a19a.pdfIn PDF document text
    • https://cdn.sqhk.co/kinubowa/ahduQjb/giwumozixenejigu.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/ibxjggj/game_screen_recorder_apk_download.pdfIn PDF document text
    • http://gutprod.xyz/luxiwidakewnu59o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386851/normal_60002256531e6.pdfIn PDF document text
    • http://pressit.space/dd_5e_magic_items_list3digg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E50 5740 bytes
SHA-256: e102981a5e3c865da0de2d121feb3b2e31d1cfefcb3d41b55fb917043ffd393c
font_01_sfnt_off000121ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CA 11872 bytes
SHA-256: 4e91212162cd65cd38aecbdaa33cdd2241edf1e71dd90d14221095f5276ff4e7

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