Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab0505d3f4cc15b…

MALICIOUS

PDF

69.8 KB Created: 2021-03-12 20:49:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f8119bec443748526f8f574c293d8027 SHA-1: 3367a4a94887dee4f9a01097632695abbf3fe4aa SHA-256: 4ab0505d3f4cc15b4292592e20dc07bc0bd480f4a3f76be324d8915cb117ec57
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/award?keyword=soluciones+practicas+bernardo+stamateas+pdf+gratis PDF link annotation
    • http://witaxolexigabi.mywebcommunity.org/nefuzesawalororodub.pdfIn PDF document text
    • https://degulula.weebly.com/uploads/1/3/1/0/131070998/tezanuwiwezo-mowesi.pdfIn PDF document text
    • https://miwevedadig.weebly.com/uploads/1/3/1/4/131437981/6519750.pdfIn PDF document text
    • https://sazalilo.weebly.com/uploads/1/3/4/5/134592982/zulapozin-nasuvoserugiwiv-wusiketugovate-tavosegemewoj.pdfIn PDF document text
    • https://kororopimebopam.weebly.com/uploads/1/3/4/6/134645688/3836999.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/does_oregairu_have_a_manga.pdfIn PDF document text
    • https://cdn.sqhk.co/rixutixim/D6ijh5j/68602919640.pdfIn PDF document text
    • https://cdn.sqhk.co/tazakabebilo/hiidOY8/slot_games_that_pay_you_real_money.pdfIn PDF document text
    • https://lajizifoposu.weebly.com/uploads/1/3/5/9/135958207/binisuku.pdfIn PDF document text
    • https://cdn.sqhk.co/kidobogi/jb8ido7/fazatutunitamuder.pdfIn PDF document text
    • https://kotutoxegaru.weebly.com/uploads/1/3/2/6/132695780/pozuterewux_virawamenuw_nunipit_nakat.pdfIn PDF document text
    • https://zawevujavesid.weebly.com/uploads/1/3/2/8/132814930/2678258.pdfIn PDF document text
    • https://xafukulirodut.weebly.com/uploads/1/3/1/3/131379356/xusumiwanijeseso.pdfIn PDF document text
    • https://xonifosanonozo.weebly.com/uploads/1/3/2/6/132680915/92745a03ec09.pdfIn PDF document text
    • https://duxudalo.weebly.com/uploads/1/3/4/8/134866109/durafugi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_9749844b57a04c0eae9e6aeda443e1fe.pdf?index=trueIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_97636d982e06481eaa494ffd29718689.pdf?index=trueIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_6dfe25055df0424aac657da64f11b7e8.pdf?index=trueIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_b02fcf0519e6484291cb0f0c5a818f83.pdf?index=trueIn PDF document text
    • http://zowofiz.myartsonline.com/15554318198.pdfIn 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_off0000d0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E9 5716 bytes
SHA-256: 86a69199088ac249a96960197111d12f77e3910100102abfb047c3b193c1f790
font_01_sfnt_off0000e449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 11328 bytes
SHA-256: 11a07c36c8ca14304b777f13d85cfc84af1f56833a55c8bbefa7cbbfb0ebe65c

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