Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f2d1654cf73f433…

MALICIOUS

PDF

68.6 KB Created: 2021-09-16 02:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ca33226fa52359c5af71ba16ff2d20d6 SHA-1: 9ef925ce223567c0e0cfd1fb1d4f7cf60b38a6e9 SHA-256: 0f2d1654cf73f4331ba97968f01dc65501a9267c68c5c7a0bc640abea8c5b01f
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 pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=ff+booster+apk PDF link annotation
    • http://gamax-motor.cz/data/dokumenty/notedogexolezib.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/59923405413.pdfIn PDF document text
    • https://htchninc.com/d/files/tamodimuj.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/duwunebibarax.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///2171330090.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/64770558372.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/xamijavuv.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/pasunakasa.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/fidonuwujefigafiz.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/81683299971.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/godunobazonejubatoxotenel.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/lizetaxizaluja.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/kuwuwilowutaxazabigisop.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/38301962780.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc3e3cc9a---71406484731.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/jipurenebupulus.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/24708135475.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/28667958941.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/mijeribiladen.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/vofuzawarususajaxe.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///siponexutovanujakukoseb.pdfIn PDF document text
    • http://rescue119.org/userfiles/file/jufuxujexitawur.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137641cda2fe---31241159379.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_off0000af5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5F 15328 bytes
SHA-256: 444575be148ff5208869ea075dc37918bf05fe4491a8582971a964a73f0952b6
font_01_sfnt_off0000d623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 10316 bytes
SHA-256: afb3e974deb78075cea4e87b7fff52e0f1c9e753cbf388cde045114ac94cb4dd

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