Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa9aabd6938fd29…

MALICIOUS

PDF

95.2 KB Created: 2021-09-09 19:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 00b9c316d152cad21442535854846fee SHA-1: 375d707df1ac56752eb2e0c696ab6cc55bfe0894 SHA-256: 3fa9aabd6938fd293d18088a7d91f402f8027de94a365f67fafb312f628852d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of this being used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345081d71ed---dijoma.pdf In PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/85810897902.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/80683635042.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/2eenef9bu7j4kqbpv1dpoomtvb/31510119548.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/gipanuferek.pdfIn PDF document text
    • https://nomortiga.com/contents/files/dafazuvaridodinagokopized.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/51024419534.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/2347078577.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/lijenovukosisizo.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/posinowomubete.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/12844444064.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/54060202166.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/70843497917.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/90956385771.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/2292910909.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/fonegukuxopaxefiv.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210907172336.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210909051439.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/jipopuwulotenet.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/21169605391.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/larabinezepe.pdfIn PDF document text
    • http://linza-market.ru/upload/files/80354346562.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/76175765259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=android+video+editor+60fpsPDF 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_off00010a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12290 19796 bytes
SHA-256: db740e0742ba17a7330ddf24dbac79ea22cdb6e70b0dc38f88ced2a9a694b579
font_02_sfnt_off000156ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156EE 10620 bytes
SHA-256: 1d1527e00ddb05b63f768b4572421a58f0ac6010a76a49352d8e44facbe71023

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