Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2088a5d9eb2a22c…

MALICIOUS

PDF

77.4 KB Created: 2021-03-12 19:53:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 666914d08b44adfe07456399af9f9c0a SHA-1: 9f485e29d68aff9a1fe4d3839b1c28746aa517f9 SHA-256: f2088a5d9eb2a22ceddef8938043e36bde4e2a998479ba5b8173e113a408f76a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://midufefew.ru/123?utm_term=inverse+trig+functions+integration+worksheet+with+answers PDF link annotation
    • http://warowusavi.mywebcommunity.org/lufupijo.pdfIn PDF document text
    • http://semengergel.ru/rukigasukhxsgf.pdfIn PDF document text
    • http://nupesupo.mypressonline.com/how_to_light_a_robertshaw_7200_gas_pilot.pdfIn PDF document text
    • http://wugupomovupa.sportsontheweb.net/music_theory_for_guitar_beginners.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388818/normal_5fded7c73f179.pdfIn PDF document text
    • http://wirelessinfo.ru/john_coltrane_omnibook0nnwr.pdfIn PDF document text
    • http://storeplus.pro/how_to_make_power_pressure_cooker_xlmdpdm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427080/normal_6026a97b65acf.pdfIn PDF document text
    • http://termometr-medikal.site/bapapitojojanaxatb79j3.pdfIn PDF document text
    • http://ledimpress.biz/loopnet_nj_for_sale966uh.pdfIn PDF document text
    • http://opt15.ru/the_hound_of_the_baskervilles_summary_in_hindi5dm2m.pdfIn PDF document text
    • http://gixapedotamerow.mywebcommunity.org/87269569412.pdfIn PDF document text
    • http://maxoranano.sportsontheweb.net/resumen_el_arte_de_amar_por_capitulos.pdfIn PDF document text
    • http://italywow.space/983603872482ir4y.pdfIn PDF document text
    • http://nubolutlion.xyz/simple_task_list_managerv6pxd.pdfIn PDF document text
    • http://pokupka.space/nowumogilinanej90upa.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/veraxawewib/90193558439.pdfIn PDF document text
    • http://vujapoguxesak.myartsonline.com/dragon_ball_fighterz_vegeta_manga_colors.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/jobukuxipasurifuron.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/manual_journal_entries_report_in_sap.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/59570021728.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_off0000ed8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8E 5264 bytes
SHA-256: 9238178171eef7544763cd539ac6d9584b846d6c9915024e2fe5b65c89461c09
font_01_sfnt_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 11936 bytes
SHA-256: e66e683df37b71fb9bbaea010cc40da3720d47ac383dcdfe6060c22e9d02bfc2

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