Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3b4970e215b192…

MALICIOUS

PDF

71.9 KB Created: 2021-09-20 02:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d8fd0d0ba23b6ffdf7192905c67e23b SHA-1: 9fdfac8b914838b36282be10f9661a2a13ab0392 SHA-256: fb3b4970e215b19295dcc7258ef93854a46f69c890df89bfb0ad4a5196ba7601
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and its classification suggest it is designed to redirect users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://itaxabc.com/userfiles/file/20210906215109_44739702.pdf In PDF document text
    • https://tecnibat.net/uploads/archivos/xafomafezipixoni.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/953bf93574b74b6d980c77f127b8d0c1/dijejadaberi.pdfIn PDF document text
    • http://tasfor.com/files/galeria/files/80493128619.pdfIn PDF document text
    • https://chineseclothingonline.com/File/gowofuluvudadatoz.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/sagutemepipuzirudo.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/patupe.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/bepudoxemigaroniwoxumuma.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/perorupilolas.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133c7a3225fc---88799728002.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/karolimuzesoke.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/74225762588.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/69770809974.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109110150117700.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/64818153898.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/wajoxokezizevibewavare.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/22618973801.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/21382270195.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/bejinefariveni.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/52911012162.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/81236911848.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/37749891799.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/9838874449.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/muxuxodazanorelupemazenax.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210911_9F369F87234C5749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=mil+y+una+noches+pdfPDF 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_off0000b4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE4 17216 bytes
SHA-256: 79c95a75f4f275c50be83ee1cd2b8707557feeb7df599225416db98bbfa2a5cb
font_02_sfnt_off0000f93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93A 10724 bytes
SHA-256: 27c53dce3a2b72bb924d361ebb0466f407f82e837d4c9849e30cb029594775d6