Malicious PDF — malware analysis report

Static analysis result for SHA-256 643c7c6d6457f981…

MALICIOUS

PDF

85.3 KB Created: 2021-03-24 13:00:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 976320867a88c85296f4bd1c3d82dcc5 SHA-1: 450f46ac3d827e886f7b996065b07f4fd4b58797 SHA-256: 643c7c6d6457f98149a2a016acb2d90599afe861d8f39a167b9de63264b2da7e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' containing 30 external links. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive external linking suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/123?utm_term=total+body+cardio+fix+cheat+sheet
    • http://bekopomulasebi.getenjoyment.net/gluten_free_food_list_australia.pdf
    • http://gudelew.mywebcommunity.org/concepto_de_salud_publica_segun_varios_autores.pdf
    • https://cdn.sqhk.co/wavagowew/hiiJjfX/govabogo.pdf
    • http://pedalini.club/how_to_take_apart_a_remotertyt9.pdf
    • https://static.s123-cdn-static.com/uploads/4415077/normal_5fe02b206c9ad.pdf
    • https://cdn-cms.f-static.net/uploads/4382778/normal_601de02db291f.pdf
    • https://cdn.sqhk.co/zowonefaso/GxhbRih/little_warsaw_restaurant.pdf
    • https://cdn.sqhk.co/puzadowoke/rCmijy6/walking_dead_season_10_release_date_dvd.pdf
    • http://reduslim-buy.site/xilebudedajimofojesowozavsbgr8.pdf
    • https://cdn-cms.f-static.net/uploads/4389101/normal_603617209b226.pdf
    • https://cdn.sqhk.co/papusabefo/tpjaZic/xotaxag.pdf
    • https://cdn-cms.f-static.net/uploads/4409403/normal_60146e6aeedee.pdf
    • http://sodaapp.club/tesapukiju817u.pdf
    • https://cdn.sqhk.co/gixotagokezu/Tja543R/tentacle_wars_2_hack.pdf
    • http://kinokaiff.space/dibujos_para_rellenar_con_bolitas_de_papel6tjbn.pdf
    • https://cdn.sqhk.co/lubometusoz/jbxF3ha/50753134016.pdf
    • https://cdn.sqhk.co/bitowiso/eiighGX/mario_kart_7_3_stars_reward.pdf
    • http://mujododaziwato.scienceontheweb.net/room_on_the_broom_book.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://d6477b75-8e4d-4453-8bbc-a86a6009e57c.filesusr.com/ugd/261d41_9c8e4e93cb344c5c9f416adef9dafe7a.pdf?index=true
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_116317879bf24637a2b9367d15aa0ca4.pdf?index=true
    • http://zitasixan.atwebpages.com/57657809099.pdf
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_697e946f9198489394d23f659bbd816d.pdf?index=true
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_50bab85114fc4e44aa74f91aa79da13c.pdf?index=true
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_072b242bb59a445dad95c663e69f3250.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffab.bin
272b914d2f68fd863666e1277dfbf1c3d6b7f47e78d72630ad6c0b0a4fb9d959		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAB 5052 bytes
font_01_sfnt_off000110f5.bin
ba85513bac0f1114ba2ed93fc1f0760ac44e6145db4302386316e3e92a4ad44e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110F5 12056 bytes
font_02_sfnt_off000139b7.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139B7 4324 bytes

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