Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39e968558aad0e7…

MALICIOUS

PDF

69.7 KB Created: 2021-10-02 11:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1f24db828ccdaf6975b243af39f140e0 SHA-1: 232f3987625d78c8853d56367f7fae7afa1d439c SHA-256: d39e968558aad0e760590a7c69fa769a94ed570889d400d1b4dc3648e17df565
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to potentially malicious PDF files hosted on various domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://osiindia.org/ckfinder/userfiles/files/sejenelorebuvulanapoboloj.pdf In PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/rotunego.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615563885f25e---luzovukonofusuvamopi.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///59838918640.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/xekakowivarozes.pdfIn PDF document text
    • https://semut73.com/contents/files/40368684829.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/zuvexabazabusibebafesipu.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/pugub.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-30/images/files/48943917989.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/zoropalemigekixud.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/bapepoxowapisenigolopalu.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021092815384036.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109230203272938.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/lopojunakibosatix.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/wumazenibinikifituri.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/70686099678.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/nikuburi.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/98908678928.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/futalezi.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/nikap.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/84782856618.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/70135244776.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/60704930708.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/93321791300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=create+empty+table+in+rPDF 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_off0000b2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A5 10412 bytes
SHA-256: 987b0fdd2f3b4d232022cadaa65086174c580250155ccb3db100d743c6335fba
font_01_sfnt_off0000c9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20A 15368 bytes
SHA-256: d84dbd8222051db9306245b10b45dc5b4fbc47a0d4a4a14a9b6bbd9dab3158c8

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