Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e37b6711211d2dc…

MALICIOUS

PDF

75.6 KB Created: 2021-02-28 17:46:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 65665092d65d06e11863303063abacb4 SHA-1: 2416ef5fc6fca5d36cd1f30ac6155c19c0f39db0 SHA-256: 5e37b6711211d2dc2aed307ec24cbf0eceaff10ca81476a399b5112b3475c707
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable hosting, and is identified as a link farm. The primary malicious activity appears to be directing users to external sites, likely for phishing or malware delivery, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=what+occupational+therapy+means+to+me PDF link annotation
    • https://tavefagizukog.weebly.com/uploads/1/3/0/7/130775361/dc5d52e5c.pdfIn PDF document text
    • http://jikusofare.mywebcommunity.org/22554281173.pdfIn PDF document text
    • http://larokamexi.sportsontheweb.net/sony_xbr-55x850b_remote.pdfIn PDF document text
    • http://nupewijanetari.medianewsonline.com/does_severe_punishment_reduce_crime.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472788/normal_600b902fe53c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412379/normal_5fdd79e0ef1d7.pdfIn PDF document text
    • https://bopidojosonek.weebly.com/uploads/1/3/1/3/131384153/fb471e894ad9.pdfIn PDF document text
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/kufitosilinimefe.pdfIn PDF document text
    • http://jodujimapiwox.22web.org/free_online_car_repair_manuals.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pofiwun.rf.gd/what_is_meant_by_the_great_apostasy.pdfIn PDF document text
    • http://bajobakokela.epizy.com/acknowledgement_notary_form.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/fibijinurulimed.pdfIn PDF document text
    • http://libafal.epizy.com/fapapufapizedov.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB3 5288 bytes
SHA-256: 70fd30d2897dcf48eb72f482ee9cddbbc8f9f7f0b52940b1cfc6edbea47192cc
font_01_sfnt_off0000fd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD95 10424 bytes
SHA-256: 93fee668efcd06ed1187d220ba478716184ed5e62e172fc357dddf87f5204bfb

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