Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6188a28b9295fe9…

MALICIOUS

PDF

80.0 KB Created: 2021-09-10 09:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1786401a165a0019eceb9bd14d43a7e9 SHA-1: bc171ad2e70f5b40808bc4abb4103e9e47ebd96f SHA-256: c6188a28b9295fe9ecb89d8d98b939546a78c471de91f6a72e7159da6b095951
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's purpose is to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://grimastone.ru/files/kiril.pdf In PDF document text
    • https://hoangnhataudio.vn/media/files/padoxejafagikom.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/51280396543.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/tifavowenupagaputu.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/61527998272.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/44676203549.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/13451290540.pdfIn PDF document text
    • http://rc-modeller.se/images/file///pisefazefarusejav.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/51140040403.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/nixutan.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/70227599117.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/83440424869.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/7390909012.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/27916506829.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/30234952719.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/satufewumepawalena.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/piwudikes.pdfIn PDF document text
    • https://red-adlay.com/upload/files/momokerubo.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/zuburadi.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/95182573787.pdfIn PDF document text
    • http://co-mit.com/uploads/files/doxaxidirasosaxan.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/17240805159.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210903004854_2142569112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+install+jiotv+in+mi+box+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://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_off0000d3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DA 17516 bytes
SHA-256: 8ba3bf82d51a4aa017d73922a0e9ce6294ebd80ef12d2a7fc83dc7f0ddff1dc2
font_01_sfnt_off00010163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001197a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197A 10724 bytes
SHA-256: 7629be905f72e775f28afd0ffa206f407ae5c9d84ce02802d7272e8061dd5ed7

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