Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f0e030690ab767…

MALICIOUS

PDF

88.6 KB Created: 2021-09-18 12:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 841c3877e6511486c825bb1740394be9 SHA-1: 60ac4c94ecf752ad2051cd33d10a241b29107326 SHA-256: 12f0e030690ab767c8f841ac996c07a3b5c40c8c830b4398b42d1e11a75637b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. The PDF contains numerous embedded URLs, many of which point to potentially disposable domains, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to lead users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://bhttourist.com/upload/fckimagesfile/52142101052.pdf In PDF document text
    • https://blogsma.com/files/61413193777.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/25758588109.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/56870708854.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/7652993214.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/20528080408.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/latutugobifa.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/66185945692.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/ginarudamubujow.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/27987060691.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631174974_a6902babf3.pdfIn PDF document text
    • https://plasy.com/uploads/file/94484682247.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/movoruwekubo.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/nirokawexugonex.pdfIn PDF document text
    • https://emprenderem.cl/files/mewodujavoserulibom.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/ratumopomejumini.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/13419787527.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/gekapokepogu.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/kimepofaxiriru.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135238922216---71210547445.pdfIn PDF document text
    • https://htchninc.com/d/files/lexib.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161443211921fa---55015490661.pdfIn PDF document text
    • http://fructusartis.com/i/File/28930052126.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/13495522738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=kodi+firestick+4kPDF 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://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_off0000fa2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11241 10320 bytes
SHA-256: 375160489832855397909da03b752d85894cf79d6a636ad2a63967844b6a5562
font_02_sfnt_off000129b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B0 18548 bytes
SHA-256: b81d1c4474053c9640b9131b51c225f29979b5fc891e5311f884922a1c1e5354

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