Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcfbbd168e63e667…

MALICIOUS

PDF

85.8 KB Created: 2021-09-21 06:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1bcce3161c0fd686664c0eb3529ed2b0 SHA-1: 1afb7d686be48bccefc94e01614a5e71a2510c23 SHA-256: bcfbbd168e63e6670f3af17afc7ee92034ac78f5322c714ea02143fd9aaba4c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=dark+theme+for+chrome+on+laptop PDF link annotation
    • http://getampedmag.com/ckfinder/userfiles/files/petogozalamoget.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/69043172380.pdfIn PDF document text
    • https://birotex.rs/images/files/35808309051.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/mudotumojumipukabufiz.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/vebejizapasodaforujuli.pdfIn PDF document text
    • http://esen.life/userfiles/file/duvadumoriv.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/zobogosorafuxaditovorefi.pdfIn PDF document text
    • https://longhoang.vn/upload/files/53317893405.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/pawedutasuluvanopelawa.pdfIn PDF document text
    • http://htwy.com/upload/file/wenasoseguwuzitujunasunuf.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/72582189918.pdfIn PDF document text
    • http://4226080.kad.tw/kads/ckfinder/userfiles/files/2466164841.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021091402472773499.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6df2caa1f---zatoxo.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b9e98fe63---47118078097.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///jawanogefalirugedifotine.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/25611150095.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/94856612788.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/96668612645.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/jevoxenoxoxanigexiwezu.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/10686466259.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/343664955.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/93341319195.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/11781333826.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_off0000ea78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA78 10580 bytes
SHA-256: 1d56b3619e141cb9911300179d58968be6b9c682abb3dd9c3742b0e17092a076
font_01_sfnt_off00010272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A84 18140 bytes
SHA-256: 974dc013f00caf7ab59944d8c7f97af16b9da7330bca1b7761925297ed68ac11

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