Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26676e12f8db0a3…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 03:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bfa4a0c40fb0000fdf64792485b5e6fc SHA-1: fda28f83e345795815d6f0ad43a7d2ac979eda25 SHA-256: e26676e12f8db0a3e1a0dbfdf2bcd002cdbcea23e448006e4db9fe24084b602b
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 suspicious domains and are likely part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's intended to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://agape4u.org/userfiles/file/fofexoru.pdf In PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/84070965090.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/lapabuxasefaku.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/kakirat.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/28260056299.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/rikiwobowexofupevawaj.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/kanutosulodejito.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109152323002523.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/xujibisos.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/21964830758.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/wovepefazopogu.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/18169592013.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/70069313657.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210911002855_kzgy14.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/bedaxosowazilavedelufaw.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/lebikovadimozafajotad.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210907103451.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/6399dadda9aca38d1dd81041c92fd720/80547654939.pdfIn PDF document text
    • http://www.heksan.com.pl/file/fabenixedogugojuzilu.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bobit.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/sifuwabumusedeki.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/10693067234.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/60057095142.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/11898006064.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/donuxidal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=meteo+animato+androidPDF 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_off0000dd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2F 17924 bytes
SHA-256: 442e73b7ccc4dfadc8603d1db80849b378ef3ddf40789513fa09ed5f58cef15c
font_01_sfnt_off00010c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A1 10188 bytes
SHA-256: 72b66b46d21a248321cfb5b2f56b8bf7d66afa6a319c0131366acd5a100ff367