Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc6b012d7a064f0…

MALICIOUS

PDF

74.0 KB Created: 2021-09-20 03:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d4b83f76c714c2be7212e190523f3ff2 SHA-1: 0b3e3536f703ab2361bf208852aad9c4b9968ebc SHA-256: bfc6b012d7a064f036282946f1a0225fb110b85ce0b83e153490ce8129384721
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating a malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a link farm designed to manipulate search engine results or distribute malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://yjsyrj.com/userfiles/file/13996084064.pdf In PDF document text
    • http://as-eng.biz/userfiles/file/xoxupiletademiribun.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/kemajakejazagutido.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/bikojub.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/72874519479.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/jaaukpedbh2tvlr1fvk8j3latj/rofobe.pdfIn PDF document text
    • http://markone-tools.com/upload/files/zemolurepegopawisinaro.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/xakupepesun.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/xepubesixu.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/natakigoruxixeze.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/mofudelefovukezejexur.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/14499707867.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161370db81aa3f---nokakiw.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/13597687122.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/xavoziwanagirumibero.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/15054591373.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/22691410577.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/peneme.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/18018892147.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/dezowonegesodej.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/dirisatasonazozuvuwiduvew.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/38640035074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=fifa+21+mobile+mod+apk+unlimited+moneyPDF 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_off0000c016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC016 10988 bytes
SHA-256: c7d678579c0edea8142a11a6b173c06c8bc94a04f6af636c310d8f29b5f9050c
font_01_sfnt_off0000d96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF181 16048 bytes
SHA-256: c6f907be8c5795942f1a8de8fa96d65be61b523cd409c16c25256d2538f192f7

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