Malicious PDF — malware analysis report

Static analysis result for SHA-256 24338ad349281825…

MALICIOUS

PDF

75.6 KB Created: 2021-03-29 03:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 9743779ecc010097fd6ee83670c9eb9b SHA-1: d5bd3227f6fa3d21663bdaa3507f23d6fe777c56 SHA-256: 24338ad349281825e030ad52d7d3238f8df8b1f18eeaefcff17fdf4779b4804e
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary URL pointing to a site related to 'cloze reading passages' which is likely a lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links on disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/wix?keyword=cloze+reading+passages+direct+object PDF link annotation
    • http://vifijes.22web.org/86002684755.pdfIn PDF document text
    • http://wutoxurusot.iblogger.org/iop_ceng_application_form.pdfIn PDF document text
    • http://tufipenuvabiwed.iblogger.org/61448297733.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421336/normal_5fe145e11a52a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501810/normal_5fd0f9d46e12e.pdfIn PDF document text
    • https://cdn.sqhk.co/tawunipufop/hjOgcYp/96649755147.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzipogowita/fimsIMt/54573686597.pdfIn PDF document text
    • http://xapufogoximemin.22web.org/coleman_powermate_6250_parts.pdfIn PDF document text
    • https://cdn.sqhk.co/giwitosak/ygesggx/thumbelina_frog_song_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/busibelifiv/ieBrTja/83662824893.pdfIn PDF document text
    • https://cdn.sqhk.co/jujejorule/jjjaHaA/land_of_doran_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/varomapit/ICigLQ1/potoxazafurazisemimikug.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/whdZTAA/44_cats_a_game_for_the_buffycats.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovipawe/5LjijgR/36012900865.pdfIn PDF document text
    • http://fenekobusasag.22web.org/english_language_and_literature_class_9.pdfIn PDF document text
    • https://cdn.sqhk.co/tisumusef/KGXiijh/cannon_master_shooting.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369631/normal_5fec3217ec33a.pdfIn PDF document text
    • http://modebedunizux.iblogger.org/kilinujafu.pdfIn PDF document text
    • http://nexekuwa.22web.org/sibabigidasowate.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duzunop.rf.gd/rogafamamuragere.pdfIn PDF document text
    • http://nojisibi.rf.gd/mrs_piggle_wiggle_read_aloud.pdfIn PDF document text
    • http://mumizoxagoguros.rf.gd/pudutakisomowuma.pdfIn PDF document text
    • http://manatezolixoguz.epizy.com/best_reader_windows_7_ultimate.pdfIn PDF document text
    • http://bananamiw.rf.gd/lusepunikoxinun.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_off0000e9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E4 5412 bytes
SHA-256: 9a95462a8ef74def4c7f72422519e5412e672ad308e403ef89782a40bfc8d4ad
font_01_sfnt_off0000fc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC59 10836 bytes
SHA-256: 58ca9939e85abbef8a01a92db5c46cfb0d385a1397c52bbad7d3cdc09711e3b8

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