Malicious PDF — malware analysis report

Static analysis result for SHA-256 133d2c2c7178dc24…

MALICIOUS

PDF

84.0 KB Created: 2021-09-15 18:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f27ff3d4d1be917b370ac2818175a2c SHA-1: ad6e70c0785302dc88e0eb43ef1a6f93bab39df7 SHA-256: 133d2c2c7178dc2419d33080761da5a6b5eab00c67ed1df983cf9045a073e68e
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 point to suspicious PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to create a large number of links on disposable hosting, reinforcing the phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://thestarbusan.com/FileData/ckfinder/files/20210901_912186BDDE2FCD26.pdf In PDF document text
    • https://benmoonpharma.com/userfiles/file/zojuxisa.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/80078195098.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/kuligipokagigawo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134aefeb5fff---bigurenovobasatoximoxevez.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/71750324158.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/vudosonik.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/nafalegeg.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/genodutiridotilibux.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffb91f04c3---munewelunotewed.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/84789777908.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/sozukuxiluvaxekadug.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/kavubolemu.pdfIn PDF document text
    • https://miet.hu/kepek/23212967922.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/89948245902.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/20854917238.pdfIn PDF document text
    • https://kham.vn/userfiles/file/benusufefapaliw.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/pirogada.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/pejawimiropij.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/59333070496.pdfIn PDF document text
    • http://bscartridge.com/pic/rarinezazuviret.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/nakoxitigomabinodanotowi.pdfIn PDF document text
    • http://brlairport.com/images/file/sovutojinuxezasobogobim.pdfIn PDF document text
    • http://regcureguide.com/files/files/zudunuwobef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=oald+9+apkPDF 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_off0000dac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC6 22100 bytes
SHA-256: fcec1c0541b83e0b17f168ed9216382bc11ea97238aac2532632d227aaf58ed1
font_01_sfnt_off0001149c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149C 9856 bytes
SHA-256: 673b27899eacd5a10592bcf354f21899b7cfcb86a821630522c96ad3b2d3a532
font_02_sfnt_off00012a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1