Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3626b4eb9054db…

MALICIOUS

PDF

78.2 KB Created: 2021-09-23 11:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 428e898b116e0ee92ff043022255438f SHA-1: f864295a4d099f0bb0c537877b4a483f88ecac92 SHA-256: ab3626b4eb9054db9a1cb3259c767616559e6c9f7bf8186b9b5a34d5d689e4d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or are part of a link farm, suggesting a phishing or malware distribution scheme. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document's primary function is to redirect users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crewmak.ru/uplcv?utm_term=play+solitaire+unblocked PDF link annotation
    • http://www.centralperdana.com/file/jakununesugot.pdfIn PDF document text
    • https://www.canoe.ro/Extras/ckfinder/userfiles/files/55068999626.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/52809130472.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/ruzutopetowuxu.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/56015799693.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/19073317095.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/gukaladonekik.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/firebekarewi.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/ligodemuv.pdfIn PDF document text
    • http://caratow.be/userfiles/file/linukir.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/migomigezabofepe.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/52198939969.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe1928711d---51945738457.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/81242562813.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/levaberelimif.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/3696290949.pdfIn PDF document text
    • http://recviem.ru/img/upload/47712756162.pdfIn PDF document text
    • https://redac.ch/upload/sejigeb.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/dagekijaginexorukodegat.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/jonamu.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/79035863844.pdfIn PDF document text
    • http://chinalabware.es/d/files/25660540069.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/70383321790.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_off0000cbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE400 10812 bytes
SHA-256: 1388bd75f85fa9fa2a68222822e31a5e6d669bf950f73fbc53548c3b8beaa116
font_02_sfnt_off0000fd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1D 17792 bytes
SHA-256: 5dc9c6810010f461350066ed35ac1c481829ef1d79babfe2ea66843e16e9a89d

Open this report in the interactive analyzer, or submit your own file for analysis.