Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36b9eff76c892ec…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 17:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d538e35082c2b0ca7b274e04876ffed3 SHA-1: 991b2ea813de14ea3b531bc5367207a8cc4c8d68 SHA-256: b36b9eff76c892ec34fe17b2ef5fb2e3aa50e02aa57d6e130dd8ac32468d5b25
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URIs, many of which point to external websites, indicating a link farm or redirection mechanism. The presence of a heuristic firing for 'PDF_SEO_DISPOSABLE_LINK_FARM' and a ClamAV detection for 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://medvor.ru/uplcv?utm_term=reolink+argus+2+instruction+manual PDF link annotation
    • http://sendedianqi.com/upload_fck/file/2021-9-3/20210903155502950386.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/24274213467.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/52735563689.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/63826600360.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/mazaxumolagusikol.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/lenojaxed.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/71875063574.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/kikilojawu.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/sazenuleladugabalo.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/jojolukomel.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/20866730102.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/78657065449.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/52524338957.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/38329661385.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/pisomo.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/82497267528.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/xepozavijone.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/56282910848.pdfPDF link annotation
    • http://raffaelecavazzoni.com/userfiles/files/fomemil.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/87736128874.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/83711673019.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/58180685355.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/40317563667.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137102cd8999---vezujenizimimerorizugela.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/sexutetuvisumesaji.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/f0b459f9ed6e4ebfe6b30a00461bc926/78162949035.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/54147618870.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/zuzidavenamogibejugov.pdfIn PDF document text
    • 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_off0000dd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A6 19012 bytes
SHA-256: ec67d42d73e1dbbbb27dae7e6dcdc69b26a58d76dbdceb795e44f1e8635a1cf3
font_02_sfnt_off0001267f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267F 10932 bytes
SHA-256: a546f676429aa03131463cffdd3fce76d2b0330f26df084a7e5f39aa78dff8f9