Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a27e099d1df17d…

MALICIOUS

PDF

84.0 KB Created: 2021-09-24 00:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dc3097bf69bc37d42b0490812ec9f5d1 SHA-1: ba10f53985a7b11cf7383665b9017ef4c6a4e815 SHA-256: d3a27e099d1df17dd6e6199f18cd997e42b4c300b0d0b1c810dcd42111fd64a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://huntic.ru/uplcv?utm_term=introduction+to+production+management+pdf PDF link annotation
    • https://komunalno-vrgorac.hr/files/41200492018.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/lapupisuwi.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/divobodigonubutolavug.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/47370823659.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/45469171996.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/23079214898.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/92363179505.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/8e91c79b400a563d4cf8bd9f7eaa3465/bivirotubax.pdfIn PDF document text
    • http://vinmexindia.com/uploads/52504804743.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/98779190700.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16130920c02a25---37491065273.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/39537378598.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/46971332332.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/zomiwezafibudidiw.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/87039053184.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/nobetewiparane.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/wumolobinakewugemefapeb.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/3560057738.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/30806134748.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/femomasesu.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/fafiro.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/vepuban.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/66605045087.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/pexuliseru.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_off0000e45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC70 17564 bytes
SHA-256: 0d3d169300a38f2b0a22b020beca4d7d12dc2e5bae48a0cec2702c9071145491
font_02_sfnt_off000129f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F8 10800 bytes
SHA-256: d1a3f9e30072d9feaf7131cb88f792e9c4c1345f1b4ed22c3f3e937110e2e7f9

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