Malicious PDF — malware analysis report

Static analysis result for SHA-256 39fe80f18d9b8599…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 08:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 755cada4c2f7fb0d0dd0da6186354e67 SHA-1: e09622629507e3c97f4dacc294956465ec621096 SHA-256: 39fe80f18d9b8599d14feeea98b9d790e1459d7d142c260402f40ab28cdc83af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the overall structure and URL distribution align with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://alubiasdetolosa.com/files/galeria/files/13005743107.pdf In PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/43653341824.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/vebajesovoben.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/gaparafa.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/fokotikatilefinus.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/binuvepaga.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/xobod.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/7895513462.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/16738496060.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/50763862998.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/nixeg.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/tibalep.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/21501285136.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/20710694895.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/61939968361.pdfIn PDF document text
    • http://exima.kr/userData/board/file/3956734669.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/bosawimenotazedimita.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/82170762988.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/kevugani.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/53758133873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=long+words+beginning+with+pPDF 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_off0000d750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD750 17572 bytes
SHA-256: af33d7248a7ee19cf82ac2aa931805996069aa26b779100dd60f7d06db10835a
font_01_sfnt_off000104e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E3 10648 bytes
SHA-256: 05334e8bc3cb24df8c05f1a833e8198a8a88dbbc0510a410a14d3216cba35efb
font_02_sfnt_off00011cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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