Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b317430e1168d58…

MALICIOUS

PDF

85.6 KB Created: 2021-04-02 19:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d9d79ab3148a239c8cc55ae625a8353d SHA-1: b0250d48b60529299f4124c60ab4a05cd120be11 SHA-256: 3b317430e1168d58b7d30ab0cceff8242785304bc40e013de1c7f7e64d54574b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://crophysi.ru/award?keyword=les+adjectifs+possessifs+exercices+fle+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471083/normal_6047583846f35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379387/normal_5fc62412d1b6b.pdfIn PDF document text
    • http://sekodosara.22web.org/87385328549.pdfIn PDF document text
    • http://ruxuzosok.mywebcommunity.org/firawaxusepidavetawijevo.pdfIn PDF document text
    • https://sepuvomaxobaba.weebly.com/uploads/1/3/5/3/135311468/8719155.pdfIn PDF document text
    • https://basixafonamolod.weebly.com/uploads/1/3/1/0/131069750/mubikakov_vepomes.pdfIn PDF document text
    • https://rulozakowix.weebly.com/uploads/1/3/4/7/134730123/8893333e5da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456728/normal_601384211e74d.pdfIn PDF document text
    • http://jefevivavifax.scienceontheweb.net/sea_doo_islandia_service_manual.pdfIn PDF document text
    • http://pojekofa.iblogger.org/30417983832.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://firasakujataj.epizy.com/54046186379.pdfIn PDF document text
    • http://rudogebititugi.rf.gd/66972667023.pdfIn PDF document text
    • http://pilomewolax.epizy.com/goveteke.pdfIn PDF document text
    • http://wuxodevidupibe.epizy.com/62985894055.pdfIn PDF document text
    • http://kamuwizedelas.rf.gd/microbiologia_veterinaria_libro.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/26175490479.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/chess_openings_book.pdfIn PDF document text
    • http://kinuzana.rf.gd/privatkonto_buchungsstze_bungen.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79C 5236 bytes
SHA-256: bef918ed2f9fb06e833b5b30e240f9a52342c1a84a3fb10663aeda204e5bc723
font_01_sfnt_off0000f987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF987 2884 bytes
SHA-256: 5c558618dff369c2b900462a2c05a26cd535293f5b4c043723e2c7e55145be0c
font_02_sfnt_off00010593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10593 13764 bytes
SHA-256: 595de75cac009ba839f6871873bb34642e76dbfca77f03c8bb4ae4a07fd62324
font_03_sfnt_off000130ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AD 16280 bytes
SHA-256: 4be807b0233ff0583ba3e3c338d72484a7dd7cd6acd67bf69b141904071cc97b

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