Malicious PDF — malware analysis report

Static analysis result for SHA-256 490550cdcac22618…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 05:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2d3be7851dc882b97dbf727decbedeb5 SHA-1: 662ac34e879859132c2fa4ec89dc4f2ee26185fd SHA-256: 490550cdcac22618e1b3a6e0bdaf9a47243b68506e62e24d8fea42492de1a4b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to other PDF files, suggesting a link farm or content distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating a tactic to manipulate search engine results or distribute malware. No scripts were extracted, but the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://speakingparrot.com/upload/ckfinder/files/85569279270.pdf In PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/moruvekusonosabipid.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/tixarumara.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/pulovuriti.pdfIn PDF document text
    • https://bunianco.com/other_files/File/26302449858.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lajalumakenu.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/90801897742.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/jijixadevela.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/bedizikolegifuxak.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/xudebofavofitusibipigopav.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/segoputevijom.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/nazusuziwekej.pdfIn PDF document text
    • https://phm.vn/upload/files/wixowiradozuzan.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/41840936393.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/74595677718.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/tokiset.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/rusexodu.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/ronudojezuxavavawa.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/puwijadagujivuzowalo.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/77002182023.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/vosanikimulemuzotoduragof.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/74757938346.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/mobusepedus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=free+android+to+pc+mirrorPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE062 10440 bytes
SHA-256: 54ed7a8cde27736bda4ecf59fe7fc555327ea114452c0992baec3a8564c87b27
font_01_sfnt_off0000f7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11006 18044 bytes
SHA-256: e30d38775564daf3ee7b375d7599bfd4e8248a8d877f8ecc5e0469ae5c22a353

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