Malicious PDF — malware analysis report

Static analysis result for SHA-256 c286dcfb5adbde7f…

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 21:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 512a79056d916742de402ea5da9a0255 SHA-1: 9b2c3aae5a37e1ca97aa1e9c5f8f1a8b34387779 SHA-256: c286dcfb5adbde7fc31b4600c7147507ea13020aa79863d279d6173c041fad3d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.sauminandy.com/fckimages/file/67016989361.pdf In PDF document text
    • http://technoauto.jp/js/upload/files/47609795991.pdfIn PDF document text
    • http://pcparts.fr/ckfinder/userfiles/files/mokalivivadexape.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/gitezopo.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/zulike.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/56880363636.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/muvegalelifoxedajuzir.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/pubuxegoxusubarusowu.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/31916860297.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/14914206691.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/wasejifop.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/660774062.pdfIn PDF document text
    • http://theponghop.com/upload/files/pujirogefetelezupi.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/mozama.pdfIn PDF document text
    • http://csp.hu/editor_up/bibuweras.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/lukogodomivuvukaguxon.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/79792447348.pdfIn PDF document text
    • https://proia.bg/userfiles/file/dojejerila.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/35898855840.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/35360342861.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/68111921246.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/gugopufevivavunosuruvu.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/sodexonudorikiles.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=vidmate+apk+for+android+downloadPDF 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_off0000d1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F4 10636 bytes
SHA-256: f3790588b6a9a9f82d5612eda1f4e3454158850bb65729323adbdccbe3c15ca7
font_01_sfnt_off0000ea4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4A 18600 bytes
SHA-256: 90f901dfe6264b15986ac8dfb8929f4b93b35181eac9f55c2999895245c6dbff
font_02_sfnt_off00011a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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