Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e0a1a8f649e39c…

MALICIOUS

PDF

68.5 KB Created: 2021-03-15 04:51:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdb3dfa28dcfb1fd872d8172b64ff623 SHA-1: 912bbc4c53964489ccf84d4385349a3777942f29 SHA-256: 80e0a1a8f649e39c06dbed62f6bed059d64b45e4f73ff4cf43b31f7634ace560
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it is part of a link farm or phishing campaign designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=ferrari+458+spider+for+sale+used
    • https://cdn.sqhk.co/jenireni/Nqidbha/i_wish_you_were_gay_billie_eilish_lyrics.pdf
    • https://cdn.sqhk.co/mowezeto/H1xheNt/lucky_money_remittance_near_me.pdf
    • https://cdn-cms.f-static.net/uploads/4416512/normal_6025138f540b8.pdf
    • https://cdn.sqhk.co/zanudiwageg/ijeYggp/uncrowned_queen_book.pdf
    • https://cdn.sqhk.co/tiruxugajo/GjjtVXk/lajumelikumopilekek.pdf
    • https://cdn.sqhk.co/depifozopupe/hBNgfif/vajiwejimexosewipekukato.pdf
    • https://cdn.sqhk.co/zubavagi/iihdib2/final_fantasy_14_free_trial_registration_code.pdf
    • https://cdn.sqhk.co/naludibeg/uhdgepU/jakefujusazeregose.pdf
    • https://vonuvevija.weebly.com/uploads/1/3/1/4/131407152/6e24712da8027ab.pdf
    • https://cdn-cms.f-static.net/uploads/4417208/normal_604d6f7f972d5.pdf
    • https://cdn.sqhk.co/wusakituzu/idKhjge/guess_the_disney_character_quiz_answers.pdf
    • http://jalazekesofijot.medianewsonline.com/amebiasis_cutanea.pdf
    • https://cdn.sqhk.co/seseniluvus/jdiihet/masha_eo_urso_brinquedos_toys_r_us.pdf
    • https://cdn-cms.f-static.net/uploads/4468274/normal_602a57d85801e.pdf
    • https://cdn-cms.f-static.net/uploads/4453108/normal_60270c7a10efe.pdf
    • https://cdn.sqhk.co/kasunelebak/iIHzwfw/13610906911.pdf
    • https://cdn.sqhk.co/vizinifum/hfNlWhc/mini_golf_paradise.pdf
    • https://revininone.weebly.com/uploads/1/3/1/3/131380081/popanot_xovezoroxogonak.pdf
    • https://cdn.sqhk.co/ginijetemepa/tdtgf9n/cours_javascript_ajax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://perexuwofogefo.onlinewebshop.net/26622888410.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_off0000cf17.bin
ad1daa1c617c99f42d3bc47f6d4830af3ae336bdba291e0add245189dbb5e4b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF17 5396 bytes
font_01_sfnt_off0000e18e.bin
e4a86cbcf9ae8ca32c4dccc50a4190154332d58eabd45724466d4b74e03b4d79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE18E 10344 bytes

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