Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0425fa609963a7d…

MALICIOUS

PDF

71.3 KB Created: 2021-10-02 14:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: da2cc86890b82a40ffd46e3cb017dbb0 SHA-1: 272459abebcb60e3d8b405cf046f87c1ff121b3e SHA-256: f0425fa609963a7ddc8cc34204ffbe342faf46a77d8e68e664a49cbf2fe64edc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external, potentially malicious domains, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a deliberate effort to obscure the true destination or host a large number of lures. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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.
  • 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=if+the+us+electricity+and+the+telecommunications+industry+are+deregulated PDF link annotation
    • http://marcus-1.com/FileData/ckfinder/files/20210922_B7F098FD26A929BC.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/25908351076.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/3151747308.pdfIn PDF document text
    • http://jn-zhsc.com/upload/bitoworiku.pdfIn PDF document text
    • http://nhatnguyen.vn/media/ftp/file/51915616797.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/487437670.pdfIn PDF document text
    • https://telorgabus.com/contents/files/65090926784.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/46026899209.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/rutagezudu.pdfIn PDF document text
    • http://c-amc.com/upload/files/rozetew.pdfIn PDF document text
    • http://inphilong.com/upload/files/fiwikerozimozugojew.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/44403038919.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614202cbf1930---66499925585.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/51358757271.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/22572770869.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/52224389962.pdfIn PDF document text
    • http://yanartextil.com/firma/files/59084127238.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/41346273938.pdfIn PDF document text
    • http://arsvet.ru/img/upload/mifevalorixetugulapisenop.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/32581210382.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/fovivosikexubikijevop.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/pilebafefemelorokogo.pdfIn PDF document text
    • http://e-menu.hu/editor_up/13278918746.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/papejezefejifupofovediwi.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_off0000b109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB109 11088 bytes
SHA-256: df6d3fb0215801a0109e3cbc4fd244c979141d5591ca27806e3c6ef9ae08006e
font_01_sfnt_off0000ca84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE296 16676 bytes
SHA-256: 3149bf0126642e694a251e54b2d8313b4bc88aa86d581ecceb6291fde68b17c3

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