Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc775350d36ba7f1…

MALICIOUS

PDF

70.7 KB Created: 2021-10-03 08:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8045887a3edf1fe021cbb7297f35dd65 SHA-1: f2a62910dab379b37c03d080c92a80162176b7dd SHA-256: cc775350d36ba7f1272fd70f256949646058f30d5295f4dde90d8d17a5909715
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://thechelseaff.com/user_uploads/files/24958340209.pdf In PDF document text
    • http://abworder.com/uploads/files/gerutowijewip.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/buvetinazunozebiruvemefe.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/takagoruxonukitomege.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/41321136827.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/luniv.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/majuwakalufopab.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/89304983348.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/5667133450.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/30884175017.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/torilosofilo.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/27248846945.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/wezefamivewox.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/tepujitiv.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/galojewejarev.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/bumujerigisule.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/22435617364.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/fanovadudenuv.pdfIn PDF document text
    • http://fitviewer.de/files/file/diridisov.pdfIn PDF document text
    • http://toroisg.com/public/images/files/56120922488.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/loxifivapufalewes.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/93295026420.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/tinokukowikuwavesoxokunax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+save+a+protected+pdf+as+unprotectedPDF 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_off0000b158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB158 16764 bytes
SHA-256: 5f155dde821a441ad4bf25622d7fbd6348e644471bb675c9fc0da48a423b1d1c
font_01_sfnt_off0000dc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41B 10716 bytes
SHA-256: 551bab81a9b024c527a13d76ed951a0ac73ae2fb932749109a614ef84489051b

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