Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd354224520c0e30…

MALICIOUS

PDF

69.6 KB Created: 2021-10-02 13:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 100fdebb07b32c58d04aa1b8786e8383 SHA-1: eaa28928fcaa0de1f2c8ae07d0bd78ea349475c5 SHA-256: dd354224520c0e3074112454d8c61e423d4b93ea7a8e58b5f558116f4bed7d7e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was flagged by a machine learning classifier and ClamAV as malicious, with ClamAV specifically identifying it as a phishing trojan. The PDF contains numerous embedded links, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users, likely to a phishing site or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.taxivanclass.com/uploads/ckfinder/files/89090707956.pdf In PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/tisowojes.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16140eea80fdd9---divusamerotujezis.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/40495316762.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/jelikedunupab.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/30351685444.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/lenadugupojisuxor.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/vikofeneg.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/64124259675.pdfIn PDF document text
    • http://cncsprings.com/d/files/63565697508.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/28737488120.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/riruponelizaf.pdfIn PDF document text
    • https://hum639hb2-hh38.com/contents/files/nofapabanubijabi.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/52521141856.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/goresakewosoxuxosawu.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/1197759025.pdfIn PDF document text
    • https://music-group-store.com/upload/files/83554979696.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/66175252331.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/16174407177.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/13163631032.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/183c37fc0970ff8a1f350a93026e0f99.pdfIn PDF document text
    • http://japhina.com/upload/file/bodupol.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2c42680b6504613403f083c731dbebf0/polowej.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/39462721151.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/70324446858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=both+teams+to+score+strategyPDF link annotation
    • 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_off0000b28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28E 10604 bytes
SHA-256: 35aedd6ca0e4f90c29a264b8c479add5d846230c76d0d33f042b120ae94465f7
font_01_sfnt_off0000caeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FD 14916 bytes
SHA-256: dedb59d4c909dd060747d7912f175e797fb8e513ebe523a9d05c62f288f69f11