Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bed172181b7e52e…

MALICIOUS

PDF

69.4 KB Created: 2021-09-29 06:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5efd38311a589f946d994c762aab7c44 SHA-1: 0e042cd13c88ee393ff5ecec2e9196fa7f1b56d9 SHA-256: 9bed172181b7e52ef3149c55fa75e1dcdc08da1e879eafe26357f829f65e6eb6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism to distribute further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for such links.

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 http://studioguatta.it/userfiles/files/lulorora.pdf In PDF document text
    • http://gps-tw.com/CKEdit/upload/files/ruzavaweberowat.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613357279bb2a---xifofamorulidigesi.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/zozaf.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/27895236300.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/79813547379.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/d67d4357c168f5d5103cf3ac263b79dd/piwefikitar.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/91618145130.pdfIn PDF document text
    • http://allier-genealogie.org/File:/48704090401.pdfIn PDF document text
    • https://soechi.id/userfiles/file/30647424851.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/zegobu.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/musetofatefebamo.pdfIn PDF document text
    • http://8njl.com/userfiles/files/62045104988.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/92195237262.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/vorujadanek.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/namojiwusematuzuzobexetid.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/jutita.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/xolazodexavigofisabep.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/fotebusagemibogu.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/40675838119.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/81428708038.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/vokedotetujezev.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/semiburovoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=watch+fugget+about+itPDF 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_off0000af25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF25 16440 bytes
SHA-256: d600761d643852f3eafddf7191cc95b0c348af27113c3c1333cd6c4982195286
font_01_sfnt_off0000d8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CE 10432 bytes
SHA-256: baec85c6c90d06abed692938cc85c0085f25e2eb4d089d33fe01ec44f4bd1a4a
font_02_sfnt_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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