Malicious PDF — malware analysis report

Static analysis result for SHA-256 0001b020d7c28875…

MALICIOUS

PDF

73.2 KB Created: 2021-10-01 06:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 542029eda830db694db290de3179fe17 SHA-1: 44bf1faca5a924ef2cb71ab590f4e48a8a6041e4 SHA-256: 0001b020d7c2887513c12444404aa0f66319c863ca49387ccaa31dbc3a0bd4ec
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 are hosted on disposable domains and appear to be part of a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=kingsoft+office+for+android+4.0+free+download PDF link annotation
    • http://glassick.com/userfiles/file/83625996447.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/21694225680.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/22837802166.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/61001752470.pdfIn PDF document text
    • http://ativn.com/upload/file/67444430844.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/jikisobeworip.pdfIn PDF document text
    • http://df-2.de/images/daten/file/74470499619.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/zikozutigowopiviwapi.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/65103029978.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/73275624066.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/62020620358.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/sokorotanuvi.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/roponigirodasoguresazeg.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/3lskj7olt3ufpjvpsbcbmp5etb/34020596580.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/77679553087.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/fewizasozinuvujelogok.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/6bf493d188541ad08cc8518b77103789/tetatoduvekubekozi.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/58481720054.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/dokajanon.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/vejorekabujodemexudoso.pdfIn PDF document text
    • http://ijfbn.com/editor_up/jofepunebor.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/78022700039.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/vizipekawazebukesosuti.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_off0000b5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A4 17724 bytes
SHA-256: 967e151e35c441ffe342f0bf70b11d3ae149ce9de78df06728b4f4710467fe00
font_01_sfnt_off0000e34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34A 10996 bytes
SHA-256: e8cc2e37b6f39747debd4e99dc6f34065b234cec80101b718c59adfd3a432383
font_02_sfnt_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1