Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f396ab26909fb80…

MALICIOUS

PDF

80.2 KB Created: 2021-03-15 23:37:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 28e7c6896f86add5977590546621c75c SHA-1: 4f8fefd261b22c54bba0a3d60bd6aa69d511fe6a SHA-256: 8f396ab26909fb80e17dea8179690640ea4d3ca735469bf33838bfdd7d37e078
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, with several identified as link farms on disposable hosting. The PDF's structure and embedded links suggest it is designed to redirect users to potentially malicious websites, likely for phishing or to download further malware. No scripts were extracted, but the PDF's nature and the heuristic firings strongly indicate a malicious intent.

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://seumenha.ru/wix?keyword=kaisi+yeh+yaariaan+episode+137+written+update PDF link annotation
    • http://magnetfix.store/full_software_sites_list6904n.pdfIn PDF document text
    • https://setejurisu.weebly.com/uploads/1/3/2/7/132740540/c5bea57.pdfIn PDF document text
    • https://linezeludamaxen.weebly.com/uploads/1/3/4/3/134340908/zikurugozom_jafufakowamufim_tujulusiriko.pdfIn PDF document text
    • http://8bitbeardsco.com/eye_abbreviations_ougphpp.pdfIn PDF document text
    • http://winoraama.fun/tofabesubivosogowovagelmqfm.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/gicjbAn/fejilagekiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392860/normal_6033a3ed20b9c.pdfIn PDF document text
    • https://kevigedevuk.weebly.com/uploads/1/3/1/4/131438682/aa2ec87641dcc.pdfIn PDF document text
    • https://cdn.sqhk.co/pememobuwir/jieQhij/retifofo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417669/normal_6003878bd816f.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/how_do_you_reprogram_a_white_rodgers_thermostat.pdfIn PDF document text
    • http://matteset-spon.space/project_management_frameworkxiuyd.pdfIn PDF document text
    • http://stopro.store/how_to_use_virtual_dj_on_laptopzg7s7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369788/normal_5fdc117be04e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/tokyo_ghoul_kaneki_sad_meme.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/century_21_new_brand_guidelines.pdfIn PDF document text
    • http://gafodix.myartsonline.com/sharp_aquos_reset_pin.pdfIn PDF document text
    • http://supajiwa.myartsonline.com/zizajiboxebev.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_off0000fafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFB 5472 bytes
SHA-256: 0be5605f68179e8480807467fae517cde8ffcdcdae76666b7bcbbb6d0694db4c
font_01_sfnt_off00010dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBD 10440 bytes
SHA-256: d050f53e07cb7d2a2a8fe34a6fa1fb0e0f78c86715ac7d9d7a8d03cd4680e256

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