Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9faecad582eefa8…

MALICIOUS

PDF

72.9 KB Created: 2021-09-17 04:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ee786c3d560dd427a9c731574d336372 SHA-1: 5e7410b691c40049e884b5aceee83b7098ae6545 SHA-256: a9faecad582eefa8a05a33c62dc1c5cafd27d5d536d986df4fdcadba72a6036c
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. This script likely redirects the user to external URLs, as evidenced by the numerous PDF-related URLs found, many of which appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://ketchas.ru/uplcv?utm_term=android+unlock+screen+programmatically PDF link annotation
    • https://gamepinleri.net/calisma2/files/uploads/jejusojepekuruwobok.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/93880168518.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/dumamutade.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/15160607796.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/7221381828.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/rezir.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/35614256761.pdfIn PDF document text
    • https://2winit.com/Files/files/36576648891.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/likimozibebodewuwogafilo.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/sikavewoxenapurerax.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/19299039956.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/nigijegejudosedorel.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/mamusupigilafabu.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/wusexuxomedifal.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/127f22e8866c0ff0b5884075755bc001/zesak.pdfIn PDF document text
    • http://kahasat.cz/data/file/87899767720.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16143dd7814498---26111156040.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/towipusogatusenedimux.pdfIn PDF document text
    • http://allasclub.com/campannas/file/motezil.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/89893118015.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/50830348163.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/mukab.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/kexutekiwegejixonepex.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_off0000b7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D9 11144 bytes
SHA-256: e9bcc17d3fe0842bf04a1305ecb7f440479d89b491affe44c8b996f4a4e21259
font_01_sfnt_off0000d1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B9 16800 bytes
SHA-256: 4ed1f27d4ca87b7118d17a62041723bb743892f2ef2468e046ca6b1603f455fe
font_02_sfnt_off0000fd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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