Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3164d92bec7e315…

MALICIOUS

PDF

80.8 KB Created: 2021-03-22 10:28:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3c0f2ed17819cb3a98d1b28db6aca9b3 SHA-1: 71c18f504c7798b6ebac45bd3f9767c48f42e4b2 SHA-256: e3164d92bec7e3150384726cb94473f9f66e65e51a66b883f1d1b44d039113f7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution attempt.

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://jottigo.ru/strik?utm_term=is+world+war+z+ps4+2+player PDF link annotation
    • http://tapozifokun.mywebcommunity.org/how_to_find_x_and_y_components.pdfIn PDF document text
    • http://zokupez.mygamesonline.org/neato_botvac_connected_parts_diagram.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417030/normal_602c37b6c7bf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379362/normal_6036aca1358a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463808/normal_6027f530aea0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384831/normal_600d1daad4991.pdfIn PDF document text
    • http://faketikus.22web.org/vorabewiwuxomoduxaxe.pdfIn PDF document text
    • http://junumidutuzakox.getenjoyment.net/zujakigevitono.pdfIn PDF document text
    • http://tefuzomabi.iblogger.org/horizons_genesis_sheet_music.pdfIn PDF document text
    • http://gikodarekegov.mywebcommunity.org/solidworks_2020_new_features.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412762/normal_603c1a4713b90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476418/normal_603fc2b79648e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wedizakur.epizy.com/tomojuzixi.pdfIn PDF document text
    • http://famuruvif.epizy.com/anjana_songs_ming.pdfIn PDF document text
    • http://momedeturus.epizy.com/98085883172.pdfIn PDF document text
    • http://jipiluwokefeke.rf.gd/potizavuvulunuforil.pdfIn PDF document text
    • http://bawemolar.epizy.com/revamojujisab.pdfIn PDF document text
    • http://jazosorolanik.rf.gd/emulator_for_android_studio_2._3._3.pdfIn PDF document text
    • http://pozijawikubinun.myartsonline.com/satoj.pdfIn PDF document text
    • http://bexadujozopu.epizy.com/steam_stuck_at_allocating_disk_space.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_off0000ffac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAC 5352 bytes
SHA-256: d7201207ab47f7f4d5d918bd2b3bf4217fb1093723a9a888f9c991ee371bab4e
font_01_sfnt_off00011214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11214 10604 bytes
SHA-256: b60986eb0de0bf88317ed998d6952e8d0c35b423e50fc62e503da4b78b8f37c0

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