Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f09de8507a3992…

MALICIOUS

PDF

81.8 KB Created: 2021-09-14 03:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de3068614ee5e331cf480db0ea8c5500 SHA-1: 36f5200355633236ad5c47e57e41567cdad7342d SHA-256: 20f09de8507a399234f15032862302de8c761ff8c42e1f76ee9bafc48f45c3e3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document contains a large number of links to disposable hosting, suggesting a phishing or malware distribution attempt. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION firings confirm the malicious nature of the file. While no scripts were explicitly extracted, the presence of numerous embedded URLs points towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://murzilka.biz/images/uploads/file/17436351602.pdf
    • https://foodvellythailand.com/upload/files/zusifatadonogopop.pdf
    • http://dogomanhnghia.com/uploads/files/ragasomizekokusim.pdf
    • https://costabravas.com/uploads/localidades/files/62690770199.pdf
    • http://silarperu.com/UserFiles/file/17784861339.pdf
    • http://jfhconsultancy.nl/userfiles/files/34361829861.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/a015e7c30303a01f773d32b579997b52/vagafisozepesetopug.pdf
    • https://graveyards-fuj.ae/userfiles/files/97070639439.pdf
    • https://needlugs.com/userfiles/files/gigili.pdf
    • http://talk200.com/admin/admin/uploadfiles/file/56004153.pdf
    • http://staropolski.net/Upload/file/wakovoxoli.pdf
    • http://flamefitnessstudio.com/cewit/images/file/14426364325.pdf
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/75406531182.pdf
    • https://galerie-louise.be/userfiles/files/89621806710.pdf
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/96683409766.pdf
    • http://technimexvn.com/images/ckeditor/files/gukisotaje.pdf
    • http://studiotecnicobergamaschi.it/userfiles/files/34774932784.pdf
    • http://keifo.ru/ckfinder/userfiles/files/gatilobawonozubimagop.pdf
    • http://compow.net/ckfinder/userfiles/files/32632100222.pdf
    • http://sinching.com/uploadpic/files/202109040253091095.pdf
    • http://buydecor.ru/uploads/files/sadosaverefi.pdf
    • http://zawodydrwali.pl/app/webroot/userfiles/file/33481682381.pdf
    • http://axiomestates.com/userfiles/file/dilewa.pdf
    • https://wic-net.com/userfiles/file/buxuwarulad.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=speaky+apk+download
    • 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_off0000d9ae.bin
a36a03c44f8574d61ea058d85314c6920c00ff1e714b475ec19043f014162b47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AE 10292 bytes
font_01_sfnt_off0000f10d.bin
9c452eeb1e9bf80723d43c67827468d6c47c7ab67b375af9672d883982b0f70a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF10D 18340 bytes
font_02_sfnt_off00012141.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12141 16792 bytes

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