Malicious PDF — malware analysis report

Static analysis result for SHA-256 465b1d520bd9d7df…

MALICIOUS

PDF

73.0 KB Created: 2021-09-18 12:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50e0b654d72fd12f0f15aad43b8fc8f3 SHA-1: d15e22b62a12cc7c7f6115e0ec96379975be5fe0 SHA-256: 465b1d520bd9d7dfc6882bd5266c4c402d03368b2fc15f06ac3889b2c0d7d27f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially malicious PDF files, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a tactic to distribute malicious content through numerous small, disposable links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://derp74.fooden.com/UserFiles/files/vivuwuxumotabit.pdf
    • https://albawadiroad.com/userfiles/files/57663530012.pdf
    • https://proektasis.gr/admin/spaw2/uploads/files/lijobebem.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5f53d9f21---lamig.pdf
    • https://bestcaps99.com/ckfinder/userfiles/files/simugofi.pdf
    • http://lsphc.com/userfiles/file///jolukifiwajuwefekiwupeju.pdf
    • http://theurbanbazzaar.com/userfiles/file/18410267971.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414e8bda2be---75313024984.pdf
    • http://verynailscm.com/user_img/file/bodepori.pdf
    • https://lawweb.info/mycms/admin/userfiles/file/lotubixowonowok.pdf
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/59098029993.pdf
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/32459414049.pdf
    • http://liubeauty.com/luutru/files/85939689685.pdf
    • http://mos-craciun-inchiriere.ro/fckfiles/file/banoxoramepube.pdf
    • https://www.hmgfinance.com/ckfinder/userfiles/files/kiniregobonopalul.pdf
    • http://hotelamadeustorino.com/userfiles/files/wakixatojovog.pdf
    • http://lecieldesandes.fr/ckfinder/userfiles/files/duniwepivupagaviros.pdf
    • http://palami.by/images/file/luvijagamiluba.pdf
    • http://tecksco.com/upload/files/zavutukibif.pdf
    • http://sochi-riba.ru/ckfinder/userfiles/files/15498127147.pdf
    • https://masihpt2.com/contents/files/rimekew.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=traffic+rider+hack+mod+apk+android+1
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbe8.bin
e17d915c866eeee47dc7381458a4d4695caaf76429d6cdc00c9de0b4aa8fb62f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE8 10680 bytes
font_01_sfnt_off0000d43a.bin
019c2895de3f29dd6d994fc49c10129c5e725055addd623cedaec521891d2c4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD43A 16304 bytes
font_02_sfnt_off0000fe1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1E 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.