Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c642d56365126b3…

MALICIOUS

PDF

87.2 KB Created: 2021-06-01 16:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ab342a5d6d7b45ca8e55b708077a02d SHA-1: 78044fa5677b2e747d144369ad3a81844c901567 SHA-256: 5c642d56365126b3a5512b28c794ebaacfdef6114378f9f8f23230235efcd28d
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs, one of which, 'https://cructi.ru/pbw?utm_term=can+you+download+crash+bandicoot+on+ps4', is flagged as malicious and appears to be a lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further suggesting malicious intent. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://cructi.ru/pbw?utm_term=can+you+download+crash+bandicoot+on+ps4
    • https://static.s123-cdn-static.com/uploads/4475380/normal_5fddfb67524d8.pdf
    • https://cdn-cms.f-static.net/uploads/4378855/normal_606e8aea731be.pdf
    • https://cdn-cms.f-static.net/uploads/4405651/normal_6019c6d1a3b0a.pdf
    • https://cdn-cms.f-static.net/uploads/4446155/normal_602423eebf29b.pdf
    • https://cdn-cms.f-static.net/uploads/4421048/normal_5fd0a01abdb69.pdf
    • https://static.s123-cdn-static.com/uploads/4450730/normal_5fcf9f2002553.pdf
    • https://static.s123-cdn-static-d.com/uploads/4500183/normal_60b5e82007e50.pdf
    • https://static.s123-cdn-static.com/uploads/4483602/normal_5fe16034a4f6c.pdf
    • https://static.s123-cdn-static.com/uploads/4483854/normal_5ff967a7be21e.pdf
    • https://cdn-cms.f-static.net/uploads/4409118/normal_5fd91f359e5e3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fipivuzigoge.pbworks.com/f/how_to_make_voucher_in_word.pdf
    • https://uploads.strikinglycdn.com/files/918d0b95-c6d3-4ba0-97f6-56f492d1dcf3/alphabet_chart_free_printable.pdf
    • http://wojipag.pbworks.com/f/90614305681.pdf
    • http://pobonagul.pbworks.com/w/file/fetch/144455790/asi_se_dice_level_3_workbook_teacher_edition.pdf
    • http://nikekuva.pbworks.com/w/file/fetch/144426864/jolofejanoke.pdf
    • http://paderukut.pbworks.com/w/file/fetch/144434034/zapokanijujigolino.pdf
    • http://jajisaparev.pbworks.com/w/file/fetch/144419487/como_ganar_diamantes_gratis_en_free_fire_en_pc.pdf
    • https://uploads.strikinglycdn.com/files/3ffcce19-2e77-4399-a873-8b0d8a10acc0/forgotten_fire_book.pdf
    • http://degenazi.pbworks.com/f/7827310390.pdf
    • http://jesababa.pbworks.com/w/file/fetch/144424917/23559345681.pdf
    • http://lekipirunezi.pbworks.com/w/file/fetch/144416244/lg_7190_tv_43_inch_price_in_india.pdf
    • https://uploads.strikinglycdn.com/files/26f3c7c9-4ecd-413a-a68c-256676cd28e3/17775620539.pdf
    • http://pimepovume.pbworks.com/w/file/fetch/144437877/19045312377.pdf
    • http://jajisaparev.pbworks.com/w/file/fetch/144412011/chord_sheet_guitar.pdf
    • http://kekirow.pbworks.com/w/file/fetch/144412113/hp_compaq_8200_elite_sff_pc_drivers_windows_10.pdf
    • https://uploads.strikinglycdn.com/files/247203b1-f486-4c5a-96e1-1b82fdd6fc7e/how_to_pair_jbl_flip_2_to_iphone.pdf
    • http://dekokos.pbworks.com/w/file/fetch/144416319/mopinutigazopasemojapawap.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_off0001147f.bin
d926080cd38a58b584cf87d5eed600acae3ecc1b672e9bb21bd6b83001729448		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1147F 5488 bytes
font_01_sfnt_off0001273a.bin
02786e422758ca5147bf20152386149c7dd5dea3aabbe48ac8d86e0d2d19b4bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1273A 11584 bytes

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