Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f0d4730b81e9f9…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 18:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b4ab28989c3d258ff81a45ae7aa61839 SHA-1: d3b8971ce63dcbbc696dc080683a9cb1e740b448 SHA-256: f6f0d4730b81e9f9f5f0ba3faf08092884da57346f84fa258834341ad59b5af7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ketchas.ru/uplcv?utm_term=transform+epub+to+pdf PDF link annotation
    • http://cgemfoco.com.br/ckfinder/userfiles/files/bejavewupara.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/lowidemalurusukupa.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/61547311525.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/52554006703.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/pawesufojezorekepexugigul.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/20741504377.pdfIn PDF document text
    • https://inarsindbari.org/uploads/marogifipof.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/59828917330.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/23293283362.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210920_E0DCFA542A7F12F1.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/v7rhep5ggk4v5msa4p161449nj/94866860012.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/fuguzu.pdfIn PDF document text
    • http://agavietnam.com/img/files/69679011809.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/9190938213.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/94896343423.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/2633825551.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f81e6e4dd---84522003197.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/68981812908.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/jujagosenukoga.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/limudidekela.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/fodafovimujuzore.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/77459477072.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/fenutot.pdfIn PDF document text
    • https://angkalaris.com/contents/files/zefusozudujuzadovokad.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/60216636404.pdfIn PDF document text
    • https://tarsiman.ee/files/file/69746772856.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_off0000d758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD758 17216 bytes
SHA-256: 82aa9ef253d3c2b2c1487d618d7e33e23c28f5c35d2011fc7002dcfa43af7d1e
font_01_sfnt_off00010490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10490 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA7 10724 bytes
SHA-256: 166523db6059a3c47b09a11d7ef47e52b6f541ed9223b8dd8f38c15c0b3c9703