Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba344208c29cdf54…

MALICIOUS

PDF

83.5 KB Created: 2021-09-24 04:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5f5bce9374656d532b4d4e9d22644b16 SHA-1: 725ee76e744fa4de190ca7eef208733e15833f14 SHA-256: ba344208c29cdf54b5cb255059a153fffa1837289eee620df90f3df2148cb3ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, hosting numerous links to other PDFs on disposable domains, a common tactic for distributing malware or phishing content. The presence of embedded URLs further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=lord+of+the+flies+student+workbook+answer+key+pdf PDF link annotation
    • https://bepcongnghiepphuchung.vn/userfiles/file/zujusaseketikinabunefeba.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210911190901_pwd4zh.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/86445161867.pdfIn PDF document text
    • http://metallpress.info/files/xixusidogivugojawefamimo.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/pijurine.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/45349267356.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/30439651387.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/37043908646.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/jevifixirudifipofobum.pdfIn PDF document text
    • http://limoride.net/gallery/file/rusox.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/363921581.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/sokipi.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/46242688697.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/83850364929.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/2357664284.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/9150062551.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/kifoxejexulotatopa.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/80613910868.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/rofobazo.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/xazuv.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/44809450912.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/fc6e4546c91424b1d764741cfcb4e019/87173355461.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/74972316744.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://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_off0000de37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE37 18328 bytes
SHA-256: ce0ceebd963e67d1a637cba1da651299d8b8503c4e32e86e45701713e4197e33
font_01_sfnt_off00010e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3E 11084 bytes
SHA-256: 7265f7ce20ac2e626f3861e0d81ee1025a8420f19b3575508f090ab1d1988533
font_02_sfnt_off000127dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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