Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea17bb6eaf4c9022…

MALICIOUS

PDF

75.2 KB Created: 2021-03-16 13:43:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9ee567a84929c65fa91463464bb2c1d0 SHA-1: 6b697de37befba0654d93249fdaa363b3d5517ee SHA-256: ea17bb6eaf4c9022df3d68e9a2bba0d67162522293e691605f197975e4dfcae1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous external URIs, including one pointing to 'zajinet.ru' with a 'free printable birthday gift voucher template' UTM term, suggesting a lure. Another heuristic identified a link farm on disposable hosting, indicating a likely distribution mechanism for malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

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://zajinet.ru/123?utm_term=free+printable+birthday+gift+voucher+template PDF link annotation
    • http://gedadekenoz.mywebcommunity.org/44686577660.pdfIn PDF document text
    • https://kekuzisalan.weebly.com/uploads/1/3/0/8/130813403/9e5acf14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491436/normal_5fe593bb754c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390374/normal_60115849192b1.pdfIn PDF document text
    • http://wirobigi.medianewsonline.com/65315735422.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/journey_to_the_center_of_the_earth_full_movie_download_in_english.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479446/normal_600003d26552f.pdfIn PDF document text
    • http://tifiwijewek.iblogger.org/komerotubosozadagojazo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454303/normal_5ff0ac27cb9f0.pdfIn PDF document text
    • http://felesatediz.medianewsonline.com/farmacos_bacteriostaticos_y_bactericidas.pdfIn PDF document text
    • https://kixivoveluvib.weebly.com/uploads/1/3/0/7/130775150/jiwibe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://delajadujum.rf.gd/probiotic_and_prebiotic_foods_list.pdfIn PDF document text
    • http://xowobovu.myartsonline.com/36126458220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc24828b-6cb1-47cb-bcd2-671918c853e2/bimibasitezexagutap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d21cb19-6557-48dc-8f8e-75dd68a69257/tamewaxupisowesezifatar.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/the_seeker_the_host_2_by_stephenie_meyer.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/fabindia_overseas_pvt_ltd_annual_report.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_off0000e8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F9 5648 bytes
SHA-256: 63e8bead0a4390aff8217a4cb40e40908ad13aa9de5d050af94cccb326a704e3
font_01_sfnt_off0000fc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC18 10420 bytes
SHA-256: a55dc74e53b6e8f1d8ae2bf648455d868c9cad799ae7946b55fc377b3b5b198e

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