Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9962f30e14f3f77…

MALICIOUS

PDF

71.5 KB Created: 2021-09-21 02:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f854cd4d47339d1fbedf48c47d15d2d4 SHA-1: dd7eb4635660f9fa7185502b17ebd514eb2dc92e SHA-256: b9962f30e14f3f771caa981580872d4893f9f3bf2d26be2bff66d4dc90c0008e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous links to external PDFs on potentially disposable domains. The presence of many unknown URLs suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://leresto-niort.fr/images/userfiles/files/43974572254.pdf In PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca77244aee---jorupesitobunikawarupexul.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/99846109775.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/63976751076.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/44722862825.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/60924755562.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109162156424752.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/53076663199.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/zofak.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/jusabusepesoxujevita.pdfIn PDF document text
    • http://pi-consulting.ch/download/51596523805.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/41943397966.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/kimemal.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/mowabutuzosuropegukowe.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/73360017157.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109060528542751.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/19162631646.pdfIn PDF document text
    • http://cdjuchuan.com/upload/files/virogaxive.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/datuniwatekipadebuxases.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/94217527336.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/22466922491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=major+muscle+groups+of+the+bodyPDF link annotation
    • 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_off0000b5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CE 15796 bytes
SHA-256: 939f318ace116117096916d07fbc4de7928a46b25f08d2ce8f76354593163ab6
font_01_sfnt_off0000de05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE05 11348 bytes
SHA-256: 360eccef5d189001d85ede340f128d82f0186bed8808b4186782647a0a2d4383
font_02_sfnt_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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