Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38537c0ee289d90…

MALICIOUS

PDF

91.7 KB Created: 2021-09-11 22:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7817b003aeef0b14dcebcd9a879d85bc SHA-1: 10b65549f13fd1f9926878750bed37684c45dc1c SHA-256: f38537c0ee289d909c916f4f816cdf6d7f7205e046ddc6e59af68e2a79e6681f
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to PDFs hosted on disposable domains, indicating a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://elvirajogsi.hu/ckfinder/userfiles/files/tulefewig.pdf In PDF document text
    • http://maslag.eu/userfiles/file/16771322309.pdfIn PDF document text
    • https://iwistw.com/upload/files/49737992451.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210908_003710.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137fdb034872---70145729120.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/makebapabunufajanirif.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/vesefulituxizarek.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/simifenanogozipirelun.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210903064818.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/ligerafimuto.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090719500473499.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/91051317823.pdfIn PDF document text
    • https://ismart99.net/upload/files/mesevijige.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/benosuragofimex.pdfIn PDF document text
    • http://juha.be/_files/file/73087572765.pdfIn PDF document text
    • http://netart.hu/userfiles/file/82215771146.pdfIn PDF document text
    • http://floramarble.com/uploads/fagogofumijub.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/56737467800.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/62621909538.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/54573155542.pdfIn PDF document text
    • http://peoplefoster.com/pliki/dixuvu.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/99777483636.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/budupigulivoze.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e7358b009---78913380822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=xanathar+guide+for+everything+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11606 10852 bytes
SHA-256: 8a143e99c4747b45bfbe555b85b8c1f50988192afe42e5002a6afb2e25094035
font_02_sfnt_off00012ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED0 19372 bytes
SHA-256: 72c540617a9f0136fbcb7efd92858008ee694dca74e517768116fb5addd546fe

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