Malicious PDF — malware analysis report

Static analysis result for SHA-256 82bd5c4cb4ff96a8…

MALICIOUS

PDF

68.2 KB Created: 2021-10-04 00:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6bc7dc84b7e8a000218312518b0e7636 SHA-1: 166a7910fc64e135043d84185c00ecc0db6c5f32 SHA-256: 82bd5c4cb4ff96a85f2358ddf634ef15be47c64fc525b8e84faec7f5a7500099
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites, likely as a first stage in a phishing or malware delivery chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=rock+band+2+downloadable+songs PDF link annotation
    • https://alkirbilaw.com/userfiles/files/52333460492.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/21115023654.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16155df09ba32e---16694560637.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/zubulosap.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/32226136175.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/63973069754.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f5a27caeb9---2008598362.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/gudutev.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/65726688449.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/neneguxitulu.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/4061374653.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/gupape.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/zaketobu.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/66881069501.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/70599311831.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/71062718180.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210918_AA9084840FB61537.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/41930894412.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/57838499139.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/33222989179.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/fugagabipepip.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_off0000abcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E4 10740 bytes
SHA-256: e079aad268d12a9100a6d52119fcc5d2ad9f56ea53249243806d413a856859a3
font_02_sfnt_off0000dca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA5 15584 bytes
SHA-256: d84ed79e2b3a8bfc72af3819c744228e3dd7a51cb5f2a0189e09d5cd17684c89

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