Malicious PDF — malware analysis report

Static analysis result for SHA-256 68ac86ecdfb42b3a…

MALICIOUS

PDF

74.0 KB Created: 2021-01-18 15:08:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ddcb965524891dde5f1b4c71e328a044 SHA-1: 99315c48b8bb5850f350d99dd612f41c4d42064d SHA-256: 68ac86ecdfb42b3ad00e6b2d0498516286fb6c48acbefb7682fdefbdc60595c6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to redirect users to potentially harmful 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://leonvi.ru/123?utm_term=introduction+to+probability+and+mathematical+statistics+pdf+bain PDF link annotation
    • https://site-1175091.mozfiles.com/files/1175091/simple_html_templates_free_for_beginners.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482413/normal_5ff88af4cab8b.pdfIn PDF document text
    • https://nodemudikukurev.weebly.com/uploads/1/3/5/3/135348567/2805503.pdfIn PDF document text
    • https://site-1083679.mozfiles.com/files/1083679/tekolozixiv.pdfIn PDF document text
    • https://site-1177175.mozfiles.com/files/1177175/36073076798.pdfIn PDF document text
    • http://nulonelam.66ghz.com/degixepogogubu.pdfIn PDF document text
    • https://site-1244582.mozfiles.com/files/1244582/fijixirepowasugimuz.pdfIn PDF document text
    • https://duroxogudoli.weebly.com/uploads/1/3/4/3/134318703/9912882.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416653/normal_5fa5bed7c18f2.pdfIn PDF document text
    • https://site-1244811.mozfiles.com/files/1244811/24608574783.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guxodolabisiruj.epizy.com/59581440198.pdfIn PDF document text
    • http://tejusadesivuti.epizy.com/brahmotsavam_songs_naa.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/state_accident_report_mn.pdfIn PDF document text
    • http://zubeleboju.epizy.com/46055426467.pdfIn PDF document text
    • http://matogojetize.rf.gd/40359679213.pdfIn PDF document text
    • http://witopovuketoj.epizy.com/arduino_uno_simulator_1._0.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_off0000e2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A0 5576 bytes
SHA-256: 54267122b2bfc71ee7f39ff2e4d213a7450445b5f0bf4ba2b2de65c9b42fd501
font_01_sfnt_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 10916 bytes
SHA-256: 6f023a5bcd8cd7ed637fbd3a72f22b0160d3357dfee7c98fa08a9c708eaac939

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