Malicious PDF — malware analysis report

Static analysis result for SHA-256 8773a04cdd2c57f3…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 23:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c20f038060d76a03640eb5bfefd63e67 SHA-1: f951d770482365b0c9f5a278bae002b82ed1add9 SHA-256: 8773a04cdd2c57f35359681eed66d02801b25aebcfc43bf3b96d367d7dd44874
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URLs, many associated with link farms and disposable hosting, strongly suggests a phishing or malware distribution attempt. The ML classifier also indicated a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=how+to+auto+arrange+icons+in+android PDF link annotation
    • http://alde-pace.org/ckfinder/userfiles/files/50827068716.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/degedijinotij.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/gejaro.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/13530309283.pdfIn PDF document text
    • http://pay2pay.net/upload/file/34643423189.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/fagegizasonuzegagujaza.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/2847505909.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/zetepikisorofok.pdfIn PDF document text
    • http://healthywithhart.com/res/file/koxivoku.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/torilosofilo.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/sizenoluzebovusos.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148ea7489dfa---rudewewedibim.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/limoravewudarovute.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/vuzalaniluferogifew.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/50874059419.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/sazivolesilif.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/dagenigof.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/divefadadeluvimixafe.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/lawevapifilozasulige.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/d91886c1972a7fa759fd298db71fbcd4/56817843443.pdfIn PDF document text
    • http://fajni3333.fun4two.pl/uploads/assets/file/18881273863.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/69367180705.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_off0000af09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF09 10676 bytes
SHA-256: 459c43c339bc1c6dc661ad888d1c2c5537c659384886f7383b18a26736d9f376
font_01_sfnt_off0000c77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8C 17504 bytes
SHA-256: 5c31b62f4488aa9ca59fbef1b6238676e68e3b174b2ea186547ae222c2eaa9bc

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