Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6a3e86a5075e9d…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 08:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ffe076fd9b71994e5880a9aa2014fd73 SHA-1: e1bf43be02d9bc90ac67e6ccb8f868847a694772 SHA-256: ef6a3e86a5075e9da879ab00cd0e14770999c84060d259269c618cc0b28bdab6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ctapigroup3.com/contents/files/67576047533.pdf In PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/56648470522.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/lavezixiwimekudepu.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142652c80cf9---wagavowivadujowurevived.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/58128635100.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/zirefeza.pdfIn PDF document text
    • https://oasis-travel.ro/files/lofinufinodojesifebulivo.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/74857029053.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/xotigibavifizujabolufuli.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/1322439340.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/nawarofejasiviw.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/14094770160.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/fadezufowukolokerefeju.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/18050814603.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/15344375877.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210916_043258_159.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7029cbd80---vovowajomokakejatufenubam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=truck+simulator+2016+mod+apkPDF 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_off0000cd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5B 18236 bytes
SHA-256: d0cb291d7248195c9ca5289482369eee27ddae2b90ef5a7e1d6898768cfcf47c
font_01_sfnt_off0000fd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6B 11056 bytes
SHA-256: 901b2c6e160f62ccf0ff427b7e57fe0299df5fe45256875488d481705abaf0ae
font_02_sfnt_off00011747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.