Malicious PDF — malware analysis report

Static analysis result for SHA-256 539aaafc8d6e16a9…

MALICIOUS

PDF

71.0 KB Created: 2021-09-19 19:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1c11e621f5a11e1855a0edfaa2762cc7 SHA-1: 011cadfe8e7562e6e7de6a513b1d34c5fa811802 SHA-256: 539aaafc8d6e16a90803f97b5f22441b54e47fb10901ff7965747e4e8ee5e2b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to suspicious domains, indicating a likely attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed for malicious purposes. While no scripts were explicitly extracted, the nature of the links and the ML classification point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://thelonerangerfanclub.com/ckfinder/userfiles/files/mefofujufidiravokenexudum.pdf In PDF document text
    • https://cissud.it/uploads/ck_editor/files/42660104957.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/63433216262.pdfIn PDF document text
    • https://retta-bg.com/userfiles/24624063408.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/wofobetaregiwalafekov.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/90344201628.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/66424786671.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/75816530322.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/92861514768.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/zebedotorinuwox.pdfIn PDF document text
    • https://12shio3.com/contents/files/danijujeduwilupogamowo.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///61544352768.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/sinusoxi.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/toxegowagaturitovekeduto.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/gubabilewo.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/wobuvigasupubofam.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109100354217957.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/gikepijulunumif.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/gebinogasukokubevimulowej.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/detawosi.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210912_0F8825FEEBC92C84.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/62699552761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=veinseek+pro+app+for+androidPDF 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_off0000b43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43D 10408 bytes
SHA-256: d3ae82e35a0d034098ae8109141ad5346f8f6fcdd6e42b3c2130d013c6d0a89d
font_01_sfnt_off0000cbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEA 16340 bytes
SHA-256: bc13b75065f6c562f43081d443003ee896555bfce10862c5ab107733df242d8c
font_02_sfnt_off0000f65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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