Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c25c73c78a4962…

MALICIOUS

PDF

89.9 KB Created: 2021-09-19 03:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aa1db845d2297ec4a3b91b7ff301d2c3 SHA-1: a27b1f1d97f2bf994bbd7294441bc15ae142da81 SHA-256: 65c25c73c78a49627459eeb8a7c8d8d2737f5836ad4c5dd8b7d45a8bf0bcbe21
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to distribute malicious content or phish for credentials. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pixomot.ru/uplcv?utm_term=how+to+change+gps+location+pokemon+go PDF link annotation
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/75977155826.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/nivunivagekizogomavof.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/xiwaro.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135dc8c2bef1---63167156525.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/vajawepi.pdfIn PDF document text
    • https://mlspoland.co/files/file/6877846629.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109172303417060.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/46nlvg6amo7pkfbmps58c6lji4/61426212644.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/61755769085.pdfIn PDF document text
    • http://azizolace.cz/images/file/sejixelepogusaferipojilem.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/95938536020.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/94570898800.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/nusolusosilo.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/50059513330.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/40566542268.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/wafadakowi.pdfIn PDF document text
    • http://it-hair.com/userfiles/letasujevupireke.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/57346814370.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_off0000f9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B7 18344 bytes
SHA-256: e6c8cd7a1fd095ac545ea882275fe9e0e85203ede90626acd98ae154fcc6b35e
font_02_sfnt_off00014194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14194 10892 bytes
SHA-256: 1c944377e5dd4e64727e07c80627a37ea5f82b8555f86760f1958b26167376b8

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