Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6eb338577a6bc0…

MALICIOUS

PDF

70.5 KB Created: 2021-09-19 11:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e354890daef0628757b9228d4a309d4e SHA-1: 016baebb06d8dd10f1972bf8e7ed0650b7a462fd SHA-256: 5b6eb338577a6bc0d6da513e7c44c4f6af74be85c0a438306253f9e594d6e67f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The PDF structure and heuristic firings suggest it's designed to exploit vulnerabilities or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://kopdesign.nl/userfiles/file/pugagi.pdf In PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/61707972318.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/dememuzejizodedi.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/71982875297.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/32522062958.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/43194054979.pdfIn PDF document text
    • https://digireg.it/upload/dinefaj.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/32383185784.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/15884738871.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/25130409894.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/fuvafukupelejitunireduk.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/jumukakozewugasoxuzowab.pdfIn PDF document text
    • http://bndweb.nl/upload/files/46773871786.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/xoduwibazav.pdfIn PDF document text
    • http://industrialdevices.in/uploads/9775896861.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/gufuxitofijufasumuk.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/vakopajabiduxiborijidafe.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/92458890214.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/82508745348.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/48291113880.pdfIn PDF document text
    • https://akconta.com/uploads/files/80956003651.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/66489952806.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/93303885303.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/33648940427.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442bbc81f60---fodoxuluterabozakeka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=parts+of+the+stomach+labeledPDF 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_off0000b470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB470 10688 bytes
SHA-256: add971025b7598fe9617c26239a7e8c384995ed67dc14e0870c3fdce018de278
font_01_sfnt_off0000ccfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFA 15552 bytes
SHA-256: e8490072e36bbc2bbe25e80df68b380862968088625fe8d71cafd674ba0530eb
font_02_sfnt_off0000f489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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