Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a523fae2e0805d…

MALICIOUS

PDF

74.6 KB Created: 2021-09-17 14:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b007e75bbcf272b58866e24e5833a07 SHA-1: a92fb98f3bc65e0ea39bd5f8b02da6b307019024 SHA-256: 67a523fae2e0805d83e455ea3c97a5d16db84d613bc0a811229c4db578d15d4c
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/nbbi5mav2s9530s98avh8roo13/fiwif.pdf
    • https://fertilizergranulatorprice.com/d/files/duzijor.pdf
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/68315280750.pdf
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/69188846557.pdf
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/47455574853.pdf
    • http://rc-mst.com/mst/_upload/files/43960820621.pdf
    • https://inunekocp.jp/mailmagazine/upload/files/96553948743.pdf
    • http://falconfam.com/ckfinder/userfiles/files/16294929185.pdf
    • http://duef.ru/public/file/kojulatanasuwo.pdf
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/loxesimetudiwe.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da9d3da4c3.pdf
    • http://viswinkelindex.nl/images/uploads/mesadoselugapediwebatug.pdf
    • http://beautifulmoda.com/userfiles/files/15040622601.pdf
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/kasububi.pdf
    • http://papierplus.pl/userfiles/file/98777433254.pdf
    • https://doina.md/fckeditorfiles/file/jepabum.pdf
    • http://www.halpellet.hu/userfiles/files/gizuvonuramejeb.pdf
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/fawipepogekufikoworogale.pdf
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/31537979232.pdf
    • https://olterus.net/contents/files/bokegake.pdf
    • http://www.logomarcanet.com/userfiles/file/xoposodakemusapemerulux.pdf
    • https://baoholaodong24.com/userfiles/file/vaxovuzusegakiselumaxaw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=city+coach+bus+driving+sim+bus+games+2020
    • 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_off0000be3c.bin
0b8e2014bc4fec395e6ff25e2c1d1bbd2920832f5ef8f635b72d012f8ddc2191		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3C 11464 bytes
font_01_sfnt_off0000d911.bin
3dc7a127e9a071f074677fb5c621f14482cfa8f4fe0d34a9287e2bd74f511d14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD911 16892 bytes
font_02_sfnt_off0001050b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1050B 16792 bytes

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