Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca522c35dfc712a3…

MALICIOUS

PDF

76.6 KB Created: 2021-09-12 11:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 4f9da7a2611cd87a63216d3e9c990d74 SHA-1: d8e5594d9491cf5e09243d74ab0fc1fa79eabf63 SHA-256: ca522c35dfc712a3a7aadd5c8ed32ee14855b89c4a3a1b35f2f4b016ce23e043
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, many pointing to PDF files on various domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://rmgoals.com/userfiles/files/89982529133.pdf In PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/4967860908.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/72297955231.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/48374455742.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/22605616001.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/terisifawewo.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/37220672476.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/tiguworilasetovatawu.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/15255052415.pdfIn PDF document text
    • http://dadesigning.com/daduserfiles/files/72287921467.pdfIn PDF document text
    • https://mkontroll.hu/File/87799599272.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/39574688155.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/ripiz.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/50852181326.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/zigezudoz.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/gimuge.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/subidemakajovu.pdfIn PDF document text
    • https://cityface.cz/res/file/farug.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/18276683914.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/zivuxotiduf.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/getinosiwobuxos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=android+10+advantagesPDF 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_off0000c76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76D 17700 bytes
SHA-256: 385a3f3f8270b86d4d6716b6088cf395cd6c695e2337ba694021cf8f905e7b93
font_01_sfnt_off0000f4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE7 10600 bytes
SHA-256: 34f71a1a285bbeddbf47bb69a7c1d1c85b92d8c0e648f317540a9dcc93e378df

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