Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb20271710e6010…

MALICIOUS

PDF

68.8 KB Created: 2021-03-22 22:43:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 824886a26d074de496fc3e557a1b83c3 SHA-1: ecad68f175df63589be19ce3e603103b27da012e SHA-256: 5cb20271710e601098b5d899e0b8b3b0c1f43bca174f1a412e6d0e4862da088c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to an 'answer key'. No scripts were extracted, but the presence of external links points to a potential download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://gimoguvi.ru/123?utm_term=answer+key+fts+25+august+2019 PDF link annotation
    • http://dikerulaba.22web.org/solitary_activities_word_whizzle_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/dusujukakal/Cgnhigg/desiwofi.pdfIn PDF document text
    • https://cdn.sqhk.co/nodepitow/zshiHHZ/sirojezetiwotu.pdfIn PDF document text
    • https://cdn.sqhk.co/giripiponi/MDAigjc/marco_s_pizza_locations_toledo_ohio.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_9c7396f41a5c401fa7334b9608ea63bf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xajowu/48439466642.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/sutopeb.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/blood_pressure_machine_software.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/bureau_informatique_design_mtal_et_verre_adonie.pdfIn PDF document text
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_499fef3d2af04f8f801e6c25f503469d.pdf?index=trueIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_e05873f5a36c4d07bb6c2f9102bd264b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bajuse/napodopudi.pdfIn PDF document text
    • https://9e4d96d7-92f1-4145-9aac-d1976e75dfe6.filesusr.com/ugd/49a98b_347c0afc09374f89b4122f8148af30c6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sedowedi/diesel_performance_air_intake_systems.pdfIn PDF document text
    • http://kipalinuki.rf.gd/wafodumavafebusabufogeli.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/65609316842.pdfIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_0a8b7e9171384d9d845a3029ee3a118b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/xefanamefolaseluwaletun.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/jpg_to_cdr_format_converter_online.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_ebea1bdb8e8643bd8d191baa182c5431.pdf?index=trueIn PDF document text
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_e57d1c3b66aa4b2fa1322305217e1ef7.pdf?index=trueIn 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_off0000cc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3D 5756 bytes
SHA-256: aeda40791dcf08167d10c053090cc68fa1d7c7aa0aa687894ee0790538482bd0
font_01_sfnt_off0000e00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00B 10752 bytes
SHA-256: 7a3390c6344837140dce0c95f649f8854fa18c19b11eb3926919e39a59d00a48

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