Malicious PDF — malware analysis report

Static analysis result for SHA-256 41dffc8e157ceb14…

MALICIOUS

PDF

77.4 KB Created: 2021-03-29 06:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3aa63995064c318543e59b09c36fb50a SHA-1: eeb2df2178630a29d1bf1a14fa30a880d6f8a16a SHA-256: 41dffc8e157ceb140e902afc5ee8abe0ad78da9ffa810bef2fd3e29408f7c7fc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a link farm on disposable hosting and a high ML classifier score. The document contains numerous embedded URLs, suggesting a phishing or redirection attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely to lead users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/wix?keyword=the+nearly+ultimate+fallout+2+guide+pdf PDF link annotation
    • https://cdn.sqhk.co/wuzutuse/ic0P1jg/bass_pro_shops_springfield_mo_aquarium.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377706/normal_5ff8224dcfc16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410975/normal_601885c30abaf.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/lajjibJ/ripazodurojizexuvitukip.pdfIn PDF document text
    • http://lollipopa.online/whats_the_cheapest_tv_at_walmart6od9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415937/normal_603c527a1dbe7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530712/normal_6053e4aeb6a0d.pdfIn PDF document text
    • http://lyudi23.ru/hodgdon_2020_annual_reloading_manual_canada315sx.pdfIn PDF document text
    • http://fowagovujag.22web.org/19643608486.pdfIn PDF document text
    • http://nekretnine.site/40556240456zr20r.pdfIn PDF document text
    • https://cdn.sqhk.co/dedomafub/ifgegjz/neo_geo_mini_game_manuals.pdfIn PDF document text
    • https://cdn.sqhk.co/bosamame/umhc37N/beast_quest_ps4_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/detazido/3pfq2ja/debovaxamufol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392873/normal_6035d232e127a.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/cnjftgh/70524032068.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403938/normal_602e6081323f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456391/normal_600f87fb759c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374686/normal_5feb089782517.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404108/normal_6036f62f452db.pdfIn PDF document text
    • https://cdn.sqhk.co/ranotigu/UWDLJTS/song_hopeless_wanderer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jidapemoti.epizy.com/57213229392.pdfIn PDF document text
    • http://vodobugatusexa.epizy.com/material_safety_data_sheet_meaning.pdfIn PDF document text
    • http://zunerewema.epizy.com/ladavusujozesur.pdfIn PDF document text
    • http://joziluwegusudu.epizy.com/banking_awareness_testbook.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_off0000f1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 5460 bytes
SHA-256: 518296d403fd79bdd79d289bbf84771c8b54ffc903a130b191b260504187c096
font_01_sfnt_off00010417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 10464 bytes
SHA-256: db87a1a592274e6902219b3b55fb101bb4496e8167a63daf4132e67e5a6f6e06

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