Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f05b7abea7e9e1…

MALICIOUS

PDF

72.2 KB Created: 2021-09-14 14:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 64fadd4bc32d48205ec122ed5afd112d SHA-1: 2ca6c2025dee7d34f3e163958ff88bef09b00995 SHA-256: b7f05b7abea7e9e186ddf6b6d6d782dc80a412ca1de71ca376f82ef19406d207
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, containing numerous links to external domains, many of which are hosted on disposable infrastructure. The embedded URLs and the PDF structure suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/d38879ea393d3cef8b2c9e05d5d857dc/936796488.pdf In PDF document text
    • http://grandp.ru/userfiles/file/85688937029.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/vatogezelokutonanav.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/5374827841.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/jikadimunanozisafu.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/13/file/sogudirexukifusonub.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/73746868570.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/23473218870.pdfIn PDF document text
    • https://datajournonepal.org/files/surugararisivajen.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/xulosufakawadarunikamiziv.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/zenejajuvexuvubar.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/60364459883.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff27060de5---jawofunasepu.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210908155254.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/45284043539.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/56877215028.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/darovidaxetuxibetif.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/fisarumilituloxoluwuvazin.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/japad.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/38015063332.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/2244164667.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/duzewubozosirovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=handy+wlan+speed+testPDF 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_off0000b8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D0 16988 bytes
SHA-256: 4e02e224bed06e433c30be4005bcd60787eb450ce821248dfc2febd04f7c0c84
font_02_sfnt_off0000fc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC77 10264 bytes
SHA-256: 3033073e5edc1d78e9836d94153655bee9910cef47cd5af7d92d2965d0c7ab86

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