Malicious PDF — malware analysis report

Static analysis result for SHA-256 44d8ed423cb27b93…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 16:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 433bb0a8f06454f650d0bb454379b68a SHA-1: 9562af39459be8fe60462044515a5fc00e7fa07b SHA-256: 44d8ed423cb27b932dc951ecd19bbc6aa960999a3f90879f33703d389c1c6cb1
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://kocarbon.vn/luutru/files/27497659320.pdf In PDF document text
    • http://gsxr.hu/userfiles/file/pinelenunutusiludikodofif.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/70871880020.pdfIn PDF document text
    • http://gerocuki.hu/user/file/54473410768.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/pavenu.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/53025274256.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/58855656806.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/98894269167.pdfIn PDF document text
    • http://sksound.com/userfiles/file/tutekexefisixefaxemebejun.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/banodixidujivobemegalavub.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/97225410720.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/7860900268.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109072204297269.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/soragakegika.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/selulasejib.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/xopefekebobudumuki.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/0a8e8e78a7a86fbb1cf52b77f5fa2e6d/71888848215.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/mofunomibeduw.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/wolezodisofijukenofo.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/gafetekixokerusuleruge.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/woderugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=puffin+tv+browser+pro+apk+crackedPDF 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_off0000d6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C5 11052 bytes
SHA-256: c858c5918dac1d8f874066841a7adafec48c49d92b83b79e607746a5686d6cd0
font_01_sfnt_off0000f083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF083 18780 bytes
SHA-256: d48a90dd9d707a8d44bb8d3bd548903b8c73f19e3917478879802d2cce53a7dd
font_02_sfnt_off00012143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12143 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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