Malicious PDF — malware analysis report

Static analysis result for SHA-256 641a91f40917cc66…

MALICIOUS

PDF

71.4 KB Created: 2021-01-31 03:51:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b8613f444790e3ee19fd928eaa3dd8c1 SHA-1: 3a6156bbee6e1b9f9df11b5e5c0d5ea3f88711cf SHA-256: 641a91f40917cc66ad614fcfc9fdfd7d804df90e0c89834cf2646bc9e03b95f9
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support the conclusion that this document is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/wb?keyword=rhino%20air%20hockey%20table%20costco PDF link annotation
    • https://cdn.sqhk.co/navimoxa/hMjcheK/ice_cream_roll_maker_toy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408992/normal_5fc7a4d31c92a.pdfIn PDF document text
    • http://fartook.online/mustang_cobra_iphone_wallpaperyl4lz.pdfIn PDF document text
    • http://vienvozvrat.site/snapchat_icon_meanings_two_pink_heartsvmryi.pdfIn PDF document text
    • https://cdn.sqhk.co/jutigurotow/hgjihqC/makurejigagibixasofituma.pdfIn PDF document text
    • https://cdn.sqhk.co/gesimefav/ifFgjie/galaxy_strike_mod.pdfIn PDF document text
    • http://shoop-fl.ru/windows_10_classic_desktopw2lp1.pdfIn PDF document text
    • http://iblack.space/45087231928le0wy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401505/normal_5fd7aba0a46bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368982/normal_5feb6dbe676f7.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/jjgjcgd/74183033640.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://botalibinizor.rf.gd/97270498646.pdfIn PDF document text
    • http://notavopanugatog.epizy.com/architectural_working_drawing_book.pdfIn PDF document text
    • http://tozibuxadotoba.epizy.com/94918981801.pdfIn PDF document text
    • http://fezadup.rf.gd/bts_world_netmarble_app.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0E 5200 bytes
SHA-256: af263f26404375d37d2c416104ed58c41039fa1648841a684fe2258a6c688353
font_01_sfnt_off0000ebc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC2 10924 bytes
SHA-256: 6a435adc7acd95d48c38e3f92f0fac3f9966e5f100ad3f58bf27f9067900a777

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