Malicious PDF — malware analysis report

Static analysis result for SHA-256 467834a9c1f62a79…

MALICIOUS

PDF

71.2 KB Created: 2021-09-17 15:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df209c1b75b47f95f627d861e43f8cde SHA-1: ed99ac9401ede308dfd1df6ea8ce90f5948b8dec SHA-256: 467834a9c1f62a79a17f1afc82ece8cde8f7f9e95f092c5e7467e8249d681c25
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a likely attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document's primary purpose is to host a large number of links to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=how+do+i+find+my+sd+card PDF link annotation
    • http://togclick.com/media/userFckfiles/file/suxarisomo.pdfIn PDF document text
    • http://polletnv.be/uploads/files/feraxufumunegomusinika.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/diwixemomibafasozuvotuzum.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/gasevazigepojawodumadep.pdfIn PDF document text
    • http://novichiha.ru/pic/file/gigoratol.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/8110745653.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/70830175057.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/9539501698.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/kejisixezewapoj.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/fenerajuvonawejimilotipaf.pdfIn PDF document text
    • http://szjg.hu/images/file/pididatibowezubapo.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/kuripefivikolazuvujip.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/27370201789.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/16349799604.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/xototegawenazamubasoti.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/28531912661.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613360ee32165---sekazozudowe.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/domubifebijodaresosi.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/30855656357.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/4376933372.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/wafasivalifedivawe.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_off0000b4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD3 10552 bytes
SHA-256: e1ff38e62a61355885836f27c5fb1c3a19079306ee26e992a3b54a6a632c1628
font_02_sfnt_off0000e4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DB 16608 bytes
SHA-256: 7308279ed60e639af2ecc0aa0dc053f12a9ea882734290a1e4c365acac48b98b

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