Malicious PDF — malware analysis report

Static analysis result for SHA-256 171e005dbffe4ee7…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 21:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4e994d59f7568f40d7e3fd40d99e4310 SHA-1: 7deade4630a5866618724ee994f4f7b8f65c5820 SHA-256: 171e005dbffe4ee7290b2d2ea7e44419245a45d8c71ca4bf04d8c0816d30c8c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URLs. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using disposable hosting for a large number of links, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://hamkr.com/userData/board/file/33723402578.pdf In PDF document text
    • https://decisionstogo.com/fck_image/file/rubaf.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/bujuwig.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/zoxaxiviwedimekunekud.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/32957227098.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-16/20210916221415309419.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/merup.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/96030751463.pdfIn PDF document text
    • http://househouse.it/userfiles/files/80759439563.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/33537927178.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/40260523944.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/40454544132.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/45678702572.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613daa338453f---zinoridafebajo.pdfIn PDF document text
    • http://cssh.es/img/file/waburon.pdfIn PDF document text
    • http://malifer.hu/upload/file/nopaxaweli.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210914_348F23565562AE0F.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1630651018.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/17484200911.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/fepav.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/tinudavemivokikis.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/lexizixewaxutivajekum.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/90115933051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=unblocked+games+76+madalin+stunt+carsPDF 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_off0000c917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC917 22784 bytes
SHA-256: 2fef5a7bf313000c624823f3b30be5e23d0322170866fcb39e2a08ad247c455b
font_01_sfnt_off00010516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2D 11268 bytes
SHA-256: cfe248687b51d586a54549a826e2cdf8ffdd45108dc98291d9357b899fe54e53

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