Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf773788c648af77…

MALICIOUS

PDF

74.1 KB Created: 2021-03-30 23:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e38532ed26fd843c4070ec0f7c64f47b SHA-1: 2167f8c1fc80ad77a0bd9944d6227701e5eaa993 SHA-256: cf773788c648af772025daf48fa07730bc915973c35903393902ccf850f496a1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are structured as SEO-friendly book titles, suggesting a link farm or phishing lure. ClamAV and ML classifiers indicate malicious content, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/wix?keyword=dental+implant+complications+book+pdf
    • http://wamipivifubape.sportsontheweb.net/65049785338.pdf
    • http://nonowun.mywebcommunity.org/95411873561.pdf
    • https://cdn.sqhk.co/takepoladev/OvGgfhi/electricity_bill_check_up_maharashtra.pdf
    • https://cdn-cms.f-static.net/uploads/4454040/normal_5fd642958265f.pdf
    • https://cdn.sqhk.co/lewulula/wlja3hx/beduwulosaxififefabo.pdf
    • https://cdn-cms.f-static.net/uploads/4416810/normal_6052f195deb31.pdf
    • https://cdn.sqhk.co/wozejodes/oJidghq/dont_touch_my_phone_wallpaper_hd_for_mobile.pdf
    • https://cdn.sqhk.co/puxedepobe/gfjhNjj/rodileribuvizakerapive.pdf
    • https://cdn-cms.f-static.net/uploads/4413850/normal_6052c4c36b8ed.pdf
    • http://givimemaregudum.sportsontheweb.net/gujuvoxuf.pdf
    • http://tezijexipilimo.getenjoyment.net/cahier_journal_exemple.pdf
    • https://cdn.sqhk.co/xajevedu/eNUuie1/zm_stock_price_after_hours.pdf
    • https://cdn.sqhk.co/kupejabel/jfjihbI/bofepafo.pdf
    • https://cdn.sqhk.co/modonasuje/jkZ0chf/74414379917.pdf
    • http://xajavawinereko.mywebcommunity.org/sherlock_holmes_2_hd_tamil_dubbed_movie_download.pdf
    • https://cdn.sqhk.co/rufebumu/zjieDie/covid_wise_washington_state.pdf
    • https://cdn-cms.f-static.net/uploads/4426551/normal_601f10052c106.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e8ceee85-86bf-4804-80ab-d7a1511cbcf5.filesusr.com/ugd/38650a_4d151a16cc414e92adfa5ea59189f137.pdf?index=true
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_925b883ea3d449bdb138cfe7f1ac99ab.pdf?index=true
    • http://fidegaf.atwebpages.com/santa_biblia_dios_habla_hoy.pdf
    • http://nufulavidibime.myartsonline.com/ludaxizililefidosarufib.pdf
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_7338236cdd5f4d26972ee39622405135.pdf?index=true
    • https://45f0f727-c607-4398-b3b7-8b42e23b21b2.filesusr.com/ugd/0a84ca_bd3ff1e53a3749258a4c4d4fd479734e.pdf?index=true
    • http://sewujajapivix.onlinewebshop.net/angel_of_darkness_caleb_carr.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5f1.bin
e194e6f628be52c3ea14e6944e747423e1820802c69ff7251a64312c94040ef1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F1 5408 bytes
font_01_sfnt_off0000f847.bin
b016479bbbd79c4506a992de12a0fac74701d4fe34bab518307544b019e43858		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 10124 bytes

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