Malicious PDF — malware analysis report

Static analysis result for SHA-256 1239ad4f0809c813…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 13:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3b931dbd6906067cd2d36adfa0e6bd72 SHA-1: 40475a1e28a112920c1de2cc39d4ea8daf479b0f SHA-256: 1239ad4f0809c813b1d767c30039e0dde37e67621810af8194b3b6422f140514
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use as a potential execution vector.

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 https://synerhu.ru/uplcv?utm_term=how+to+use+android+as+webcam PDF link annotation
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145716181ed9---6106865334.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/lewamumaxawovijewoz.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/71419603818.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///13412422544.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/dadibidonemovute.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109080656309179.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/93953405103.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/64738764804.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/99459214229.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/13462657344.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/85252229422.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/81720349562.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/35942503271.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/gurugaguxubajarukagezevif.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/87277522302.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/71744832784.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/lediruluzozo.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/88805301740.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/jobigi.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/rinarezaluti.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/54720575821.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/posanid.pdfIn PDF document text
    • http://benly-carson.com/product/files/zivesenowukidizudusame.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/duborurokuraba.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/tuniwinidavo.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/nelovenodojebepifuri.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_off0000da3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 10800 bytes
SHA-256: c018169def1925bcb84b3ce3130c063eeb5ca02068aa511aa47e2850cb83d8e4
font_02_sfnt_off00010b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B39 18824 bytes
SHA-256: f01c4997cfcfbba6de016a6b05e92444e6d8c2cd1d83b97f5d79d89a2377c8d2