Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b68474ed9ce9d7…

MALICIOUS

PDF

68.0 KB Created: 2021-01-10 00:53:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 08e4aa4178e313b98b965136065a096f SHA-1: c9abf82662cd0d318985b663761f8c72da343409 SHA-256: c3b68474ed9ce9d762feb59f2510c13fec8b778cf92cc0c1be604c7012ad8d0a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. While no scripts were directly extracted, the presence of external URIs and the ML classifier's high confidence score suggest a malicious purpose, likely related to spearphishing.

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://traffnew.ru/123?utm_term=brenden+theatre+vacaville PDF link annotation
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/lorubavevotu.pdfIn PDF document text
    • https://cdn.sqhk.co/gejixoneku/nhdSjb1/last_day_on_earth_survival_cheats_for_android.pdfIn PDF document text
    • https://site-1177725.mozfiles.com/files/1177725/cooking_town_kitchen_chef_game_mod_apk.pdfIn PDF document text
    • https://datamabijiremu.weebly.com/uploads/1/3/4/6/134691522/4be97fb5d965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456372/normal_5fd98a447c924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410201/normal_5f9a245f02a21.pdfIn PDF document text
    • https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/fawigu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409118/normal_5ff50805912cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486350/normal_5fb8df418e306.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/iaugigj/play_plants_vs_zombies_mini_games_online_free.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/liwara/pavanetibutuwegefamete.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_off0000cd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD23 4956 bytes
SHA-256: a3606e7229cf234b441327adae5b5c603af7c96bce3e9b6a72d30d811036d2c5
font_01_sfnt_off0000ddfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFD 11152 bytes
SHA-256: da8b47dfeaa85b4bfa0cea28a75b7e05bbace7896ea828d5222acec5b54d1adb

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