Malicious PDF — malware analysis report

Static analysis result for SHA-256 5509e3f85223e104…

MALICIOUS

PDF

81.0 KB Created: 2021-09-15 18:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f5d29e0d96b57feb00726d19f116a756 SHA-1: 7f4c9773ef23d7b31aa84c550b73de3131306fc1 SHA-256: 5509e3f85223e104661c8d0a0f85700e61bbc73350d607e4728791de2d3bfaaf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on potentially disposable domains and appear to be part of a link farm, suggesting an attempt to redirect users to malicious content. The file's metadata indicates it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which aligns with a phishing or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134d8ad3432f---584177036.pdf In PDF document text
    • http://varosom.hu/userfiles/files/kokesonubemozipaja.pdfIn PDF document text
    • https://blv.by/upload/editor/files/tefijakipulusat.pdfIn PDF document text
    • http://asvpp.fr/pdf/wanudigojateziwapiguzefa.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/9748920551.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/tiwosodujosovawipeko.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/40357163957.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/wugugidak.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/bofatibom.pdfIn PDF document text
    • http://zerosquareonline.com/file/99933586749.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/36578631813.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/jositanagevix.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/mimazojezafonubasiwebulo.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/10917209728.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/weguzema.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/69188587393.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/6108628949.pdfIn PDF document text
    • http://stattus.com/assets/file/viwulawel.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/filofitikalukubokobuziz.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/98060345436.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/vapimumagezunopuvag.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c12d5c6bcb---10825169385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=mxq+4k+firmware+update+2020+downloadPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/79801073892.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://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_off0000d55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55D 11328 bytes
SHA-256: 5fa1bb9a71e085b561a048a7b77d2687b5296d748e247904bf54267346d56509
font_01_sfnt_off0000efd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 18424 bytes
SHA-256: 3f78570ad2027cde94e0123ce899af88c4b5620daf4b9e675df4b4a453a1b0ac
font_02_sfnt_off00011ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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