Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b1cd725f302a76…

MALICIOUS

PDF

74.9 KB Created: 2021-09-25 02:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5ca5cbc4eb73cc0dd0300e8cfed8afbb SHA-1: 09792dd5c6291b28dcb4d90479c69afe0289c5d7 SHA-256: 98b1cd725f302a761389c489f5221178b5e0736cd8c061bfd14c9f95d59a3ad6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs pointing to a link farm, indicating a phishing or SEO spamming attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://ontogepszerviz.hu/editor_up/67451492909.pdf In PDF document text
    • http://iehyun.com/editorupload/file/34754947186.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/edbc88c4752aa1d00a2ad818880d5109/83365109460.pdfIn PDF document text
    • https://proxus.nl/file/vexumorafidivarel.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/monivodizojununijupodexof.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/mavutopopedizekajoxega.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/nevodareroxuxigexuve.pdfIn PDF document text
    • https://kaparatt.com/images/File/verafowomutesosavomit.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/87e324be2929237f71a038d54c51f6aa/sojotivovuwolevikuj.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/rafavitafufel.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/jotidijitufamo.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/rirepi.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/39018308969.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/xesunemozogabofileso.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/ganuji.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/xuzarivatib.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/4411035706.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/puxetajavulukafep.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/wivetarusi.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/30026498209.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/57806870947.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/guwixigone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=my+hero+academia+ova+dubbedPDF 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_off0000b907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB907 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11E 10632 bytes
SHA-256: e5348994bc324550089bcb6f6e5d6e986b1fd1f25c8812672f6852df9daa8af9
font_02_sfnt_off0000e971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE971 19512 bytes
SHA-256: a5a2ddc83f11550524e51da1035f167e9d07388fa7ec3bd1f61b9a94e8a30121

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