Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd386f716d043441…

MALICIOUS

PDF

82.2 KB Created: 2021-09-24 01:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 438da86263e62e213a9d5a509ab4313b SHA-1: b1c4822be9b2fdde1ddf1da323a3dc7c7f346bc3 SHA-256: fd386f716d043441dbf62692cd0d49f7464551dde91cfb003fa65f1efe5a9901
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links, suggesting a tactic to obscure the true destination or spread malicious content across many domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://synerhu.ru/uplcv?utm_term=harry+potter+und+der+stein+der+weisen+pdf+free+download PDF link annotation
    • https://tomaszbizon.pl/web/uploads/files/wotivuzeladofonuz.pdfIn PDF document text
    • http://mgrima.com/files/file/15129866780.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/5445701862.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/44635069253.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/veruxudakixubekamu.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/tapatovekolen.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/25433506453.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/93375396495.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/sadisokinuvawe.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/fomipigelarapikesi.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/30956536444.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/filajabitanozakedorojeguj.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/dalajowezigimasokekib.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/5312368284.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/10334682693.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145803d81a04---tesujopogagovigu.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rofelenejikurovokure.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/temetafusezageronisoda.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/xujev.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/vaxaka.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/xidavixupukalowawik.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/83748844415.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/pajojodiwotetabuwapa.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/wijinoletolumavejazagami.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_off0000d668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7A 19968 bytes
SHA-256: f1a52f467a773f8306af40fb6fdacd43aef44e41fc74fbbe25d2acaeb6b0ae00
font_02_sfnt_off00012212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12212 10784 bytes
SHA-256: b06c2a371ca533133f2a4234b724e8420c45e06ad88ac583f1e70d0222c99373

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