Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2aab0fa6d08d23…

MALICIOUS

PDF

75.6 KB Created: 2021-03-16 02:18:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0fc7211588a7d51ac83d170706cfce89 SHA-1: b9d137cc9da79c44b46c5d83e4260a349ce6a455 SHA-256: 4f2aab0fa6d08d23b10417b28443dae780577c66e2e65042c8499c1d37a47837
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One prominent URL is http://slmit.fun/adobe_premiere_elements_13_tutorial2df6c.pdf, which is part of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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 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://botokaw.ru/strik?utm_term=what+are+the+most+popular+daws PDF link annotation
    • http://slmit.fun/adobe_premiere_elements_13_tutorial2df6c.pdfIn PDF document text
    • https://cdn.sqhk.co/tedubifo/eierMpX/bardo_thdol_trke.pdfIn PDF document text
    • https://cdn.sqhk.co/sarokuneti/4ie4hal/movie_ringtones_free_download_telugu.pdfIn PDF document text
    • https://rixevabibevata.weebly.com/uploads/1/3/2/7/132710753/3319581.pdfIn PDF document text
    • https://cdn.sqhk.co/noxibogalu/T5dii5p/craft_master_pools_naples_fl.pdfIn PDF document text
    • http://indir-kazan.com/half_life_calculations_worksheet_physical_science_answerskq1a1.pdfIn PDF document text
    • https://xivafotipumi.weebly.com/uploads/1/3/4/3/134322080/497b50.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3f4c78a-26ae-4f21-81c6-656c854993b3/how_much_does_a_liftmaster_8500_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/houses_of_the_holy_cover_art_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa408810-5906-4bfb-9698-d375a73212a2/43531015528.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/accreditation_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b4b5c59-a7bc-49f5-b7fe-d2526e7f3c5b/xirezalagiditosan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46f9cba5-2818-41b0-a174-bacdfbfd2f0f/78824225199.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8994f06c-07db-472d-918f-ebe5ea275f5d/verbos_irregulares_en_pasado_participio_y_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/62782090893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/605ca7a7-e127-4846-af43-bfb21d173db5/dometic_9200_power_awning_parts_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/arrhythmia_alliance_patient_information.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_off0000eaac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAC 5304 bytes
SHA-256: 6d7a27d4287386414999b023e5f7d3294ca3c498481948d27837cf99c1c4b0e7
font_01_sfnt_off0000fc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9D 10756 bytes
SHA-256: 96f9cdde4141220d318fabf8ffa5586f6f980e3ba97b4d838eb4cd80c7824f73

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