Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58a32ab49823f10…

MALICIOUS

PDF

76.6 KB Created: 2021-09-09 18:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9288666a2a4823c21280437c6516a1b1 SHA-1: 0cba8819074ff8ac5f0d49563a874c42affea566 SHA-256: b58a32ab49823f101f54cd9d31a4583ad9b66a1b20cd206fd5b4217f31348219
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malicious content or phishing. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://tagoproperties.com/ckfinder/userfiles/files/97225860530.pdf In PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/3546345912.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/60724244683.pdfIn PDF document text
    • http://brlairport.com/images/file/93345500757.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/60271115611.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376920be295---kigalowevosijore.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///gozijoluvakubezuguboweg.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/18019404444.pdfIn PDF document text
    • https://dellrein.ru/content/file/tulisevulizufe.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/40394308827.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367adf782e5---pozulovozizagibimugodevat.pdfIn PDF document text
    • https://digireg.lu/upload/38547016249.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/fobodod.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/guwodeze.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139346e26fc3---sitomulujizarogezobadinit.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/1380667777.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/3434984591.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/61363026223.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/72094782273.pdfIn PDF document text
    • https://2winit.com/Files/files/70814789571.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/65724526349.pdfIn PDF document text
    • http://seamacros.com/upload/file/96310798207.pdfIn PDF document text
    • http://hibertek.com/image/files/20210905_051059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+have+linux+and+windows+on+the+same+computerPDF 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_off0000c77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77D 16760 bytes
SHA-256: 1b88ed2b291f04a9f21ba731aad3aa8b8e6a783d7d82be656ea67753d8125852
font_01_sfnt_off0000f2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C5 11124 bytes
SHA-256: 39f5c80cf2c495a5e1ef748c194ff46ee908770862dbe0855d966e2b2bfe525a
font_02_sfnt_off00010c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1