Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2793ed99c7c6cdd…

MALICIOUS

PDF

72.4 KB Created: 2021-03-03 02:51:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d7825679879cb5ce91d727384d331cab SHA-1: 248f7da5009dd87a6f588a85ec609446f6811032 SHA-256: c2793ed99c7c6cddc921a5a68a65cbbb456a83b08efcafa62c5d8a5e9281dfa2
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically 'https://yafferge.ru/award?keyword=when+did+toyota+production+system+start'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of numerous links and the redirector URL suggest a phishing or malware delivery attempt, likely delivered as a spearphishing attachment.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=when+did+toyota+production+system+start In PDF document text
    • https://static.s123-cdn-static.com/uploads/4378404/normal_5ff8296a20697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455898/normal_60147a41405f8.pdfIn PDF document text
    • http://koreanluxe.com/3306184554cnoz.pdfIn PDF document text
    • http://kismyketio.com/565869781441k5qn.pdfIn PDF document text
    • http://talkme-news.info/allow_mock_locations_android_91yvcr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472773/normal_600f4a31ac01d.pdfIn PDF document text
    • https://seguvixezamab.weebly.com/uploads/1/3/5/9/135961197/jajutasifipiga_dodomeza_pugakadugugebuj_rigisujibodeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425933/normal_601b431162746.pdfIn PDF document text
    • https://varijamali.weebly.com/uploads/1/3/1/8/131856150/4e67e1cc.pdfIn PDF document text
    • http://tubipegutadob.iblogger.org/51313075295.pdfIn PDF document text
    • http://bavewemelemare.iblogger.org/jenulinisasamunemid.pdfIn PDF document text
    • http://fruit-citrus.space/five_nights_at_freddys_2_game_demo37ik1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/whatsapp_status_video_song_free_pagalworld.pdfIn PDF document text
    • http://gafojokogez.rf.gd/stihl_autocut_25-2_line_size.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/foreign_owned_llc_reporting.pdfIn PDF document text
    • http://ropipowewigu.epizy.com/rufiloxuj.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/41735669112.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_off0000df43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF43 5396 bytes
SHA-256: 043974ae808ea61097ded964f5018e4c31a784749d1d743100b6f8815f5d362d
font_01_sfnt_off0000f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 10184 bytes
SHA-256: 82b499598655599541ae8542c81284ae8c1600ef1f11605c576774a9e5a47330

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