Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b60fed4fac4fbb…

MALICIOUS

PDF

86.3 KB Created: 2021-09-13 16:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 207563a8d41d58ff9f4c53692d3d6f75 SHA-1: c5fafc10236c4569d38192c8ab722a30b73553c5 SHA-256: 61b60fed4fac4fbb4835c6e2dca633a8c19171210a0e1fda1d776d8f45d12f37
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 a large number of embedded URLs, many of which point to disposable domains or are structured as link farms, suggesting a phishing or redirection attempt. The presence of 'utm_term=marvel+games+offline+for+android' in one URL indicates a lure to attract users interested in gaming content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://fruhmann-elektrotechnik.at/99693987138.pdf In PDF document text
    • http://lamorenj.com/userfiles/file/3124958539.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/99273446481.pdfIn PDF document text
    • http://flexa.cz/docs/file/kugafujevejimijesi.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/98956801653.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/74798794657.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/73246825162.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f22de5533d---nokunoxi.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/77920556316.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210912_062917.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/75636750474.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/1708b6d1b0e8f4fde343744a4425ca50/91751648582.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/72341775930.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/9406841456.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/tixumimuxivan.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/nosunaropezufirulik.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/lotutugikoralipetimuz.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109121911181389.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/fabuxiwejasomajaj.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/97644944418.pdfIn PDF document text
    • http://mc-opony.pl/files/file/35972958690.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/zilezuvujegus.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/6293295614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=marvel+games+offline+for+androidPDF 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_off0000ef54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 10660 bytes
SHA-256: c5a2fbd96a682c195bfb360c83cd6b79a937203df4fe803d92bd3b650a2185e5
font_01_sfnt_off00010784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F96 17072 bytes
SHA-256: 3587273b82fbfdb335585b1a66951de511f25e98f40ac72062244447b2125a74