Malicious PDF — malware analysis report

Static analysis result for SHA-256 5affe41126f4e9e8…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 10:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9f1ec7d7d313776a9f7e1ccd3efda5f4 SHA-1: 455b7ae073919b0c5fdf5951ce5a9a54deeff63f SHA-256: 5affe41126f4e9e857e4b0b6beb551f795eb929615ce8d43fe73c9179175e8b4
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 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics, which are often used in phishing campaigns or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://enslev-anlaegsservice.dk/userfiles/file/37156153126.pdf In PDF document text
    • http://ladna.pl/user_images/file/nomilodopajetusowinuz.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/dopitazimosiwidamosisinuj.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/46395747661.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/bavaridudodarejud.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/zamakenenegosaruzo.pdfIn PDF document text
    • https://buyafranchise.org/files/files/xuwakefexo.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/92454156564.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/muzinuvil.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/32345918455.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/zemelironeminozufufewoxux.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/92589574011.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/dexovozopirakabomemepux.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/58066439749.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/20425650663.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/bivege.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/86974143981.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16140fc7cc3fce---dedetonavi.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/taxikemepitopajudabaxivux.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/fogujeju.pdfIn PDF document text
    • https://rinducm1.com/contents/files/83839799840.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/xevezesuxaj.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/82295600456.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/77328183848.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/49473230918.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137525c74d78---66909223957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=harry+potter+and+the+deathly+hallows+part+1+online+freePDF 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_off0000e044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE044 16860 bytes
SHA-256: c5e83de914800c2aac7aa6842f3e6e89ed0723813d852190b03ba7557abccfdf
font_01_sfnt_off00010bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F4 10836 bytes
SHA-256: d7804f77554af035e581b3bd27a4de97746c9c650808209949bbca3dd97b0184