Malicious PDF — malware analysis report

Static analysis result for SHA-256 d161051e56f56e15…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 20:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d69709a635f009e8c9a83fd3f47dc723 SHA-1: 71790528ed547fa5bd4d51100c7f044c060d318a SHA-256: d161051e56f56e1514c34a1dc8a02fd33a0afbeec82b7586fe594ce7de1809d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that likely lead to phishing sites or further malware downloads. The presence of external URIs and the link farm heuristic strongly suggest a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://medvor.ru/uplcv?utm_term=deadly+granny+3+download+apk PDF link annotation
    • https://b2b-intelligence.it/uploads/file/lilirez.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d0fe46020---23402341175.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/61163940723.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/9baabec6410873f037bbfb3bb444ffa8/zesopiwomubu.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/29127896107.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/noviv.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/68449172447.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/kutuma.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210915_160641.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/35645735941.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/165169174.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/gilidupisemak.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/jorerunawazaved.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/25191790323.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/39946357204.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/88417360688.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/karis.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210909213802.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/58156667223.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/falovuzatixamibut.pdfIn PDF document text
    • http://client.diffuse.info/files/xawolakoriladojazero.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/fiwovesusajeserixujefaz.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/wifinarubinazimex.pdfIn PDF document text
    • https://losungversorger.com/product/file/40754750315.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/7624463103.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/55243465356.pdfIn PDF document text
    • 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_off0000d9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 10676 bytes
SHA-256: 2ffccd5af8dd0e18e4f68b77a0aca1fbfca97caacdbdfb483ec6ffa04c376b2c
font_02_sfnt_off00010a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A80 17108 bytes
SHA-256: 5e8ce6b71d869042899253048a73aa75e33dad8ec79fc0e92a2d131ed677d5fe