Malicious PDF — malware analysis report

Static analysis result for SHA-256 66042285e93a5f73…

MALICIOUS

PDF

84.8 KB Created: 2021-09-11 20:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 510059c862292de87ffee8163a2adfe4 SHA-1: f623571de37adfefbefd63f0befef8f633a673ba SHA-256: 66042285e93a5f736bea568245f26089745283e4bb964b46b3e650895b9806c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many pointing to suspicious domains, and is identified as a link farm. The primary attack pattern involves directing users to these external links, likely for SEO poisoning or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://insfilings.com/skyzone_classic/upload/files/95365551278.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/m0h287gslq41gh7li3cuatn876/71996322709.pdfIn PDF document text
    • http://ud2-140.com/files/52224033433.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/99290088565.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/pegudukuwivizutus.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/41586955712.pdfIn PDF document text
    • http://air-con.ru/upload/files/27317801133.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/likunujutafinaxupoxirurar.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/474b259f511a8f7a976b33323af044d1/10762247888.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/wipatukepisola.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/rekag.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/60522968499.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/renivudazaxik.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/96998463697.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210912000736.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/fatifijup.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/73482425656.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/nuzabak.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/kulefufuvurewemejatimaf.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/tekeritivek.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/66016736104.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/56615985873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=blackish+season+7+putlockerPDF 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_off0000e470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 10768 bytes
SHA-256: 07557c7a859f7f28fe9fefb3096296ee1e351375eac7a099d57ec2a356802958
font_01_sfnt_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11556 19100 bytes
SHA-256: 85d40f29c9814458529e93f05c63a089c4ecb24bda4cf6e164422828a1d94d4d

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