Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d4bd30d673c353…

MALICIOUS

PDF

87.3 KB Created: 2021-09-17 09:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9487ec96df7b2ae31c10057a42f700f8 SHA-1: a9552a5c3c45798e61d0ade7aa4e1c967d0246ea SHA-256: 75d4bd30d673c353b0601e3bd8eaf9199f55b56622cb4bc7d417a7357374c471
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs pointing to external domains, many of which are structured as link farms or disposable hosting, indicating a phishing or malware distribution attempt. The PDF's structure and the presence of external links suggest it's intended to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://infrive.ru/uplcv?utm_term=prometheus+bound+and+other+plays PDF link annotation
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/90902946127.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/73350830867.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/13890309901.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/soviduwepadafupekoma.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/poroxemuje.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/15/file/fisava.pdfIn PDF document text
    • http://better-pharma.com/images/file/files/7556070547.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/didekiwofu.pdfIn PDF document text
    • https://maria-galland.ru/files/file/48585540050.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/rulut.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/13474104239.pdfIn PDF document text
    • http://philboyd.com/97784231209.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/91845267353.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/90080747411.pdfIn PDF document text
    • http://findusafranchise.com/files/files/rinurizuxu.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/50540662179.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/56531651020.pdfIn PDF document text
    • http://qdjshg.com/files/file/dupewabesubojisusipeb.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/61236135669.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e191477882---24467742598.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/zenisaratodekidapisononop.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/gijarufedivadod.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/tafivume.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca8500b674---povibusolixokazaniboxex.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_off0000edf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 10920 bytes
SHA-256: a8eebd4dacf6c51f5d04132170dac97f7c2cd9e545adab8d974e06af661b04a4
font_01_sfnt_off000106e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF6 18812 bytes
SHA-256: 22138e71034ac69f449a9c388e18362b473beb1216cb934423ca828e45444823