Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a1725fcf8bf26d…

MALICIOUS

PDF

76.2 KB Created: 2021-09-23 06:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7b07e1bfce749b5f4b7c0a321bd1347e SHA-1: 49a5ca1a748a1bec25cddad8d1a0be31b8df7646 SHA-256: a6a1725fcf8bf26d5cde857ae28ebd49500f0db45fe9a0d6f41db82899bcd60a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs point to a large number of distinct domains, suggesting an attempt to distribute malicious content or phish for credentials. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://oresteruggiero.com/userfiles/files/99273090103.pdf In PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/93693479151.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/dategeku.pdfIn PDF document text
    • https://thermaltrailrace.com/imagini_ws/pijepovozukuxejodipunef.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/35300902763.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/46169294863.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/parilunediwinazixudebez.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/vobumozaj.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/60911835370.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/66637436632.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/36964076418.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/45442555158.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/17f0bf0080f3552eb0fbe04f8010ee83/42792042295.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/614bf0d08a5c8.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/zoxuzi.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/xibumewajumilufetaji.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/75265353010.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/37305963468.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/pojurazupod.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/1721201872.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/dojijejowokovo.pdfIn PDF document text
    • http://mega.kz/media/upload/files/11202976445.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/9eb6b6becd296a42faf8319df737213c/givolanemasuxuxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=think+and+grow+rich+audiobook+pdfPDF 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_off0000c644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC644 17292 bytes
SHA-256: 23504ff015f6a0de5e2152ebf05acae80dad0572888b9e47ffbd99b30fc88181
font_01_sfnt_off0000f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEB 10836 bytes
SHA-256: 371c18104560ac3191dc04ccc2f2f2590fab512a7e657d2440a20ed4429b0b4e

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