Malicious PDF — malware analysis report

Static analysis result for SHA-256 69f4b7f8973895e3…

MALICIOUS

PDF

78.6 KB Created: 2021-04-18 04:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a43212f427e6b7db63f4591d4116f9b SHA-1: 9300a71a20831b22a55a1c13bba1d4da5450583d SHA-256: 69f4b7f8973895e3571eac03bd782466887e4f592812fb9ebbefe49971e8e261
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are dynamically generated and point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The document body, though heavily obfuscated, appears to be a lure related to a common technical issue ('xbox one controller bluetooth not working'). The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=xbox+one+controller+bluetooth+not+working
    • http://naykaryadom.fun/zisifosijowepovusaruvigbs4dz.pdf
    • http://kunabote.22web.org/can_a_clogged_water_filter_cause_a_refrigerator_to_leak.pdf
    • http://instapresent.site/rituzerufinozok23ngu.pdf
    • http://secureappeal.com/the_monologue_audition_karen_kohlhaas57bzu.pdf
    • http://dodemawaj.iblogger.org/nafakularariluxugef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/juzinaramip/sidimivotaxiwiwibononiken.pdf
    • https://s3.amazonaws.com/dibedamoka/nivenizujagajozif.pdf
    • https://s3.amazonaws.com/jalasilunaz/74237319156.pdf
    • http://jawugokat.rf.gd/lifovemi.pdf
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_082428d9a22747f5ba33413b7f819482.pdf?index=true
    • https://s3.amazonaws.com/werowibovezoje/25425394676.pdf
    • https://s3.amazonaws.com/xokebore/terobowebumomevor.pdf
    • http://fosisidevafepet.epizy.com/fundamentals_of_python_data_structures.pdf
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_a2bbf72d4b04404990971b358fac3676.pdf?index=true
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_b4e91f90c95a4097a0aed8028de5a063.pdf?index=true
    • https://s3.amazonaws.com/redegelesibif/hush-hush_stuart_woods_books_in_order.pdf
    • http://mezasijov.epizy.com/niwolifinoro.pdf
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_9310e14df784434f9b06292041f5b6b0.pdf?index=true
    • https://s3.amazonaws.com/wibadinavosunom/sutukulan.pdf
    • http://jifadeve.rf.gd/refractive_index_problems.pdf
    • http://tavapoz.rf.gd/play_store_app_and_install.pdf
    • http://lemuguta.rf.gd/zufarilipavexe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f606.bin
0e8e2631c60a8c938a528ac5bea86ad7a168a0016db9d15db40be4d6ae33ba21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF606 5012 bytes
font_01_sfnt_off00010726.bin
88207ed5c1cd6f68b11a6be3d0ab5d311190bc03c017f5fcd7100ab98eb45c96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10726 10848 bytes

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