Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e481a42fa293c3a…

MALICIOUS

PDF

85.0 KB Created: 2021-04-03 14:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 95dd78b87bea245617f6aead85e812f1 SHA-1: dc4466d586a74242b4b1a362b3aa9be3bbc234f1 SHA-256: 9e481a42fa293c3a24426e4979fad95dee9a554c33ed5a92984aa136f921fb6f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and heuristics point to a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://static.s123-cdn-static.com/uploads/4465907/normal_5ffd7cb49884d.pdf In PDF document text
    • https://cdn.sqhk.co/jasuxerazifo/ighgUkt/bts_dna_song_ringtone_download.pdfIn PDF document text
    • http://verifiedbadges-form.com/keto_recipes_for_freezerb2umt.pdfIn PDF document text
    • https://cdn.sqhk.co/veladaxuzeba/jcBCja1/cartoon_wallpaper_for_pc_desktop_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wetilusogaki/hhjhLoc/formalism_theory_example.pdfIn PDF document text
    • http://tokio-2020.fun/how_to_sync_skullcandy_push_ultrahhac1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444378/normal_602642103b79a.pdfIn PDF document text
    • https://cdn.sqhk.co/woberimi/ihdMdgc/jajas.pdfIn PDF document text
    • http://kuxni.su/walt_whitman_leaves_of_grass_poem_listb3thp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393626/normal_600a6501de519.pdfIn PDF document text
    • http://triple-doska5.club/epic_seven_wikiazlio6.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxumududu/jfjiED1/stack_it_up_minute_to_win_it_game.pdfIn PDF document text
    • http://ouily.xyz/how_long_steak_on_george_foreman_grill1syks.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414672/normal_6007de59cb932.pdfIn PDF document text
    • https://cdn.sqhk.co/nudavede/d9jeicA/feredepuwozuvozu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451561/normal_5fd5f17b7b4c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/jJyWpsOf3IE/wb?keyword=diferentes%20tipos%20de%20esquemas%20graficosPDF link annotation
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_d96d9d90dd5e4705ab2c657ab59760d8.pdf?index=trueIn PDF document text
    • https://beb587af-1766-4a1c-893d-8c04a9882fa7.filesusr.com/ugd/f3bec4_48d43c286b18413bb93d3cbeae73138a.pdf?index=trueIn PDF document text
    • https://8ee4d174-735f-4cd7-9396-c3a65dbcc337.filesusr.com/ugd/5ac313_11b972ec30654f0480bf66e4520292d3.pdf?index=trueIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_5da85a6df5514a53b03661a64355ab20.pdf?index=trueIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_3eda0b0a27af47758781032a89e7bfbb.pdf?index=trueIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_0fdf5c31c07b4589abcbf8bf27519ac7.pdf?index=trueIn PDF document text
    • https://f0f855fd-29d2-4bf6-9fdd-af1de8d1f91d.filesusr.com/ugd/184831_f77e90a787a1497f8fab891163bc4447.pdf?index=trueIn PDF document text
    • https://13dbc848-c95e-4197-a439-3ae2050b6ee2.filesusr.com/ugd/46bbe5_f774ea33b9c141e9bced7003ed8bc1bd.pdf?index=trueIn 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_off00010c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C67 5568 bytes
SHA-256: aa4f628893794fdd47750226f9eced244124a864a4361436dc07b40ad14ee5d2
font_01_sfnt_off00011f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F44 11432 bytes
SHA-256: 7550bdd541cddce9d28e634a2a91328a9297b67f6ec1cc879a836e988f3a4017

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