Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f63d1cfd45bdd4…

MALICIOUS

PDF

79.9 KB Created: 2021-03-30 21:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fb78c455f01b3b6f38aac488da5fdf6a SHA-1: b9815ca38a671a3a65502a0df10178130da6ab7b SHA-256: 94f63d1cfd45bdd4d34ab7d39ddcf6bb8916e55a010b6f7378ce5c7453b01a3b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://dugedepap.ru/123?utm_term=rpg+android+games PDF link annotation
    • https://cdn.sqhk.co/molivovuki/Hjj1jc4/battle_angel_alita_last_order_omnibus_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xekejegixawo/nyRijid/elton_john_songs_list_greatest_hits_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478137/normal_6034facb9ccb2.pdfIn PDF document text
    • https://cdn.sqhk.co/sesexibanobu/NjchjLv/garry_s_mod_games_to_play.pdfIn PDF document text
    • https://cdn.sqhk.co/dakusoripujo/aPhbIji/demolition_derby_2020_calendar.pdfIn PDF document text
    • http://xubajaw.iblogger.org/bosigiletabiwegojin.pdfIn PDF document text
    • http://judejoz.iblogger.org/52784370033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405194/normal_6061ed8c5acfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495034/normal_601e61711f0c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427097/normal_5fd14bacd7522.pdfIn PDF document text
    • https://cdn.sqhk.co/bosesegivu/hb4gcji/21014295365.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e3be55d-a2dc-438c-9db1-b3abd4445d9b/48513054360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27a2f827-bb33-4247-9837-05bda73f365c/52771797664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/351dacc0-e5e7-4963-a762-8b1835d978d7/john_dewey_educational_philosophy.pdfIn PDF document text
    • http://bufopalepigugu.epizy.com/down_and_out_in_paris_and_london.pdfIn PDF document text
    • http://mepojijolotezud.rf.gd/latatizokup.pdfIn PDF document text
    • http://bosovegiged.rf.gd/mutufofosix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b319f172-74fd-4b62-a65d-d98d4e82e31f/sojalapuruzevuxoge.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_off0000fb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0D 5252 bytes
SHA-256: 6d3759450b8e1f43474a0a3e5dc88f2e4abda6454e92256e80a1821d73b2455b
font_01_sfnt_off00010cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDA 10680 bytes
SHA-256: e18a581673067a20d1dacc5f5859ad6c7ff6a08611786fcea5f0c11c781abd8d

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