Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b71cbbf6e9d655…

MALICIOUS

PDF

76.7 KB Created: 2021-09-17 23:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e05c5e3976e792434bcc407611bc7ccd SHA-1: 3702abe362306c19b93b3101c77a591484a94c43 SHA-256: e8b71cbbf6e9d655f95a41678fca355f318e956badcc0916578acc0c7f42602c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://redactron.com/userfiles/file/xafewowobeme.pdf In PDF document text
    • http://fasson.vip/images/editor/files/losagobirivativ.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/zaburer.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/wevoxepaxiwe.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c516c94661---75793514359.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/patuvutusawadijimisum.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/70181817983.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/88193514646.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/60889949896.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/60419253713.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/pufur.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/96791480999.pdfIn PDF document text
    • https://wasael.com/userfiles/file/vepukotam.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/xebaverutugito.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/kovewupewi.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/beregiledazosa.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/20515180860.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/p8s176svi75po2tnioq3r52947/guminenanusipoxozujo.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/wolasemaxujusemurorifa.pdfIn PDF document text
    • https://il-gusto.com/images/file/53089872573.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210913_182656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=common+mistakes+in+english+pdfPDF 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_off0000c741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF53 17596 bytes
SHA-256: aae5dc5fbae6f79665d69a7d016af63d2d3b22b32166afc1ab12858696003f94
font_02_sfnt_off00010c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C55 10968 bytes
SHA-256: d7c210d8089741ed1ef266466c01c41a921b40b3181456f35ca6a67b9a4d74f8

Open this report in the interactive analyzer, or submit your own file for analysis.