Malicious PDF — malware analysis report

Static analysis result for SHA-256 6703b415ad03ec73…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 21:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 8e4e2af73728e7e62551d304bd90a8f9 SHA-1: 1c6ba1d89e48dc6f0ef6439a9d1b62f66d6d1b38 SHA-256: 6703b415ad03ec738a3ddf0f00de7c4fb1d27cf892952371610710a4b7eb6ef2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The presence of numerous external URIs, including one that appears to be a redirector with a 'utm_term' parameter, suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs strongly indicate it's designed to lead users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://catamma.ru/uplcv?utm_term=the+oedipus+cycle+pdf PDF link annotation
    • http://musthighschool.mn/ckfinder/userfiles/files/86225100212.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/timebutakujadelo.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/16897991084.pdfIn PDF document text
    • http://taxfreepoint.com/file/94320899872.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/cc73da3c451c9ec0ba115e21dd363dbd/65634263571.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132f73ee90db---56477757536.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/giwepebepiteb.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/bexavavu.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/42202340959.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/duzexosulobito.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/wakiwuwudu.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/xajikebadogigudatep.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/jubod.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/famepubesanozosu.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/5369023821.pdfIn PDF document text
    • http://olympusflights.com/files/files/waromafawosox.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/larexevoji.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/saboti.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/44180066280.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/wixot.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/bexitubop.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/39626821163.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_off0000d9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D9 10428 bytes
SHA-256: bd612cb7ea02546a81c506f15203acb33c80e76c24adaee3a5d92d3d379cb14e
font_01_sfnt_off0000f199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF199 17124 bytes
SHA-256: 2a412380c98e9e4518e61e04af6946a1ab2ffdb99a5abce19feb6fa2eb821542
font_02_sfnt_off00011d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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