Malicious PDF — malware analysis report

Static analysis result for SHA-256 401fa3f2fccf92c4…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 20:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f645e97eeb9e52872fad592be45fe8b SHA-1: c3488f1bcbd978d2f37ef9b5093574eff3633534 SHA-256: 401fa3f2fccf92c47c1e76f089656ecf3ffd250a5c0973052ee0c9998b150235
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to suspicious domains and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to exploit kits. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://mdtrend.hu/files/file/vojasimosodujisesikanaw.pdf In PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/75721546901.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/36131059419.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/3767770112.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/5647736100.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/wulonetabevap.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/gupupojuta.pdfIn PDF document text
    • https://brod-plovdiv.com/images/kelotapepuwufukevod.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/kexuxexufugivonepumowu.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/tonimelo.pdfIn PDF document text
    • http://cy2hand.com/userfiles/9689621673.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/18578978392.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/84314391860.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/40882024124.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/fugunos.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/tivopaz.pdfIn PDF document text
    • https://casaalu.com/luutru/files/jowapedok.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/fosixawopexo.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613507bade9cb---80956718891.pdfIn PDF document text
    • http://thevale.us/userimages/nobiw.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/gikewolutoxawixeworom.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/linasakesure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=screenshot+restricted+apps+androidPDF 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_off0000d938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD938 10640 bytes
SHA-256: c3b3188b078d14333389dae9a02eccc8de148caa4f4935e09aa9ea2f6579ad59
font_01_sfnt_off0000f179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001098b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098B 17588 bytes
SHA-256: ec39541d74852be31046be29e7aeb4f665933aa6e45fb8c3f90e452f62ccda33

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