Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95a8b9082e7328b…

MALICIOUS

PDF

78.5 KB Created: 2021-09-20 00:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0e1f8131d7a35da28f7d9b3842ba5521 SHA-1: 7a7ec83c5a7cb88d6ab71d72c9a064fe543da62b SHA-256: c95a8b9082e7328b4ca81a905a23189e6bf707f6de0bbda0b9f8f21e996adf71
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links, likely to distribute further malicious content. While no scripts were explicitly extracted, the nature of the PDF and its numerous embedded URLs suggest an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://varvshistoriska.com/file/63164948445.pdf In PDF document text
    • http://vietsinphar.com/uploads/files/wadufikekevebabek.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210920051505.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/33682736294.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161304d5c458db---72131267879.pdfIn PDF document text
    • https://orrizon.ru/images/file/70375650078.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/57210754512.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/35251443034.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/fipavizutasik.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/jozibeto.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/pabikawosekozelolofu.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/63885178863.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/u00ot9ka2ls0usvouk8ug72a1r/91049327034.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/galuzaza.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/golojiva.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/9683455398.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/97901200349.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/40425761413.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/88552006919.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630528304.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/21651650841.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/95168188566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=android+studio+calculator+source+codePDF 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_off0000cebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBC 10444 bytes
SHA-256: 9e8e138d0050941c5aed28b92cd7d9df03fee6e3d2fff11dac72890536aa6983
font_01_sfnt_off0000e696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE696 17852 bytes
SHA-256: a193abb95107e332e3a270f827c54caacccdac69165441288e4a85a79b23561a
font_02_sfnt_off000113eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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