Malicious PDF — malware analysis report

Static analysis result for SHA-256 514407211c7bc7bf…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 07:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 281cc2534513c09079e577ec989476cf SHA-1: 4f559992878cf3fbdc972ea39adbba499c708b2f SHA-256: 514407211c7bc7bf0c95fab48026d0718cf2fe457d71097bc6196629e52fb02c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, indicating it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the high number of distinct hosts suggest a malicious intent, likely to lure users to phishing sites or download further malware. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. No scripts were extracted, but the PDF structure itself is designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nomylo.ru/uplcv?utm_term=botanicula+android+release+date PDF link annotation
    • http://mamitobe.ru/files/file/26527628424.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///rijuf.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/lodimigesodebapurofid.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/devexerutadowetabegu.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/vofulusalinet.pdfIn PDF document text
    • http://crm333.com/documentos/file/90153366487.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210916_183237.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/niragixeduwezexofekaja.pdfIn PDF document text
    • https://fivetc.net/uploads/files/gebunugaludexodad.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/vetawogabofazova.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/wefunitenukepe.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/45777338668.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/momofadujovifezesunoro.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/80757159936.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/52172602166.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210904002144.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/69340107276.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/34635079992.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/jewim.pdfIn PDF document text
    • http://xtra360.net/campannas/file/vofasowojipavomuzepusotek.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/21090819262362016196sa1l.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/suzutuxisopedogelalive.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_off0000d938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 17856 bytes
SHA-256: 2af729bce1f58be1af1189279cdb0a36dcbe2a6ce8d491b3b3267b72f0d76d6c
font_02_sfnt_off00011f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1E 10516 bytes
SHA-256: 7841508c608687a060b530ab13e82e9306a4c408e8cef1c1f6144091b07112cc

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