Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8d8e75712fb089…

MALICIOUS

PDF

67.8 KB Created: 2021-09-25 11:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c3346929ae3fcfa4ca0c29a050ad4092 SHA-1: e55be87ae5079201cd46075373bf9d1277f802c8 SHA-256: bf8d8e75712fb08907fff4d6c2d16f382cbfdba03ac78a36985193b869fc27d3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, including an image-only document with an action trigger and a small file size. It contains embedded JavaScript and multiple external URIs, suggesting an attempt to redirect the user to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a downloader or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://mistral-paints.cz/userfiles/files/99175815866.pdf In PDF document text
    • http://herve-coiffure.ci/files/vuletabisaripeditogor.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/u06o6pnneb9i40ldiddm5383dt/zelijarobaw.pdfIn PDF document text
    • http://dges.in/userfiles/file/zatefudolirararedilokusur.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/guwibizazozexujunalu.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/vikanup.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/wusesanugikavazenot.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/gebuman.pdfIn PDF document text
    • https://megalight.lv/uploads/files/rafume.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/84706409325.pdfIn PDF document text
    • http://hla.vn/upload/files/71309851298.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/koratijazavifefuke.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/20/34404795734.pdfIn PDF document text
    • https://edusfera.pl/upload/file/xekilijokoresejumabone.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/kunubiravonivexotowumisi.pdfIn PDF document text
    • http://rcmo.ru/upload/files/90168687249.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/34464346723.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021971522572532.pdfIn PDF document text
    • http://jawarakreasi.com/file/2385794020.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/mosinoribid.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/pigoz.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/nokudavozusapalabojupika.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ilawetabevi.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/5792733011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=wps+app+rootPDF 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_off0000b091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB091 9864 bytes
SHA-256: 8ee5c62dabcf25b2daebdf1bc2140f4ba749aba718de39ae1d24704023269c12
font_01_sfnt_off0000c66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66D 14320 bytes
SHA-256: 9f984f1212c927ef803505188fb531d42ec1441718f9ba564008ad4195b6c01b
font_02_sfnt_off0000e9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1