Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd7ec404dfaadb9…

MALICIOUS

PDF

69.3 KB Created: 2021-10-02 20:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0917835128f2dab98fb9f1bd1cdc1ecd SHA-1: 63f290969d2e187dc4eb72041d3b89b067d7e27e SHA-256: fcd7ec404dfaadb9c6fbb2688e3ba504c2bed147917a7168bc91aea96ea8575f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to external sites. The document body was unreadable, but the heuristics and URLs point to a link farm or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=a+sore+tooth PDF link annotation
    • https://taflanelektronik.com/img/userfiles/file/galosapimubijaziterusok.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/a98aec5tmhsff1uo2gu1ttb9r3/28764205040.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/39382661295.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/dekoxaxetekemufixaxakid.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/86023582298.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/74534338804.pdfIn PDF document text
    • http://caythuocnam.org/images/files/wulijudesafufozu.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/rugowovikokazif.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/vevasowakawisuwetubozin.pdfIn PDF document text
    • http://esistore.de/userfiles/file/deduwipemi.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/67714498741.pdfIn PDF document text
    • http://nikacarpet.nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/vojafiregevepam.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/vivabuvagofotaxif.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/zubajexuradobila.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/86330938648.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/33823203438.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/9a2756abacda37b6b11db70ecb651a31/dotebuwatokulebuxejidaweg.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109061102511293.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/78716532250.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/wasaf.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/43588200389.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/belobaxebomelimez.pdfIn PDF document text
    • http://julianina.dk/upload/file/53628020597.pdfIn PDF document text
    • https://miet.hu/kepek/kukomimodupifudigiwori.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/pamazozasogefurupafa.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_off0000b300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB300 15484 bytes
SHA-256: 8ac002d5d7b9f27d9b9d5bdfd3d740cbf0d7b8aa633e52d12e188896e6c95682
font_01_sfnt_off0000d9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E4 9780 bytes
SHA-256: b426695b18b85b57476bb0d1d19029084cb1716cd3aab6e436be9e2591cbf5b7