Malicious PDF — malware analysis report

Static analysis result for SHA-256 3264d66bd4f24817…

MALICIOUS

PDF

90.5 KB Created: 2021-09-13 00:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71e9fa1d0bf4d908aa97aed45dfa06fe SHA-1: 69160d82b3ab862c5aabe27a638574f2a6c4ae4d SHA-256: 3264d66bd4f248174d5801ac30868e85b92b58d3b9732dddeea8c5d4ebb66481
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://comillaspostgrado.es/userfiles/file/32096298931.pdf In PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/boxitovokulomisata.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/wiwureluzojatok.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/vowenikoletalixarigux.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/61552680876.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/xebekobozimesesitosubomi.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/84672615761.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/vabisolaj.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-4/20210904175957833375.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/7113077456.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/zutoguter.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/pufeximisoketipigaw.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390d700bb55---89824349668.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/70329843719.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/gegazotepubelemota.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/9769054610.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/36156461148.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/jibuwiboxanuxave.pdfIn PDF document text
    • https://mmtours.si/uploads/48677696911.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/57337409988.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/vasolarop.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/xulobavewoker.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=new+season+walking+dead+season+11PDF 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_off0000fb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB04 10432 bytes
SHA-256: cd50983a769871726187dd350b4acd98000df883d6598d73e5406f8f0e0c14fd
font_01_sfnt_off000112a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A2 18960 bytes
SHA-256: a358de0785578d8dd2329cd57b1c0a68d5d6b3a9e3beb43fa318653164cc2db1
font_02_sfnt_off0001446d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1446D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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