Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4ff553515b3081…

MALICIOUS

PDF

80.4 KB Created: 2021-03-22 10:09:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c80d9a0d7cdfcf57e0e2c3a3c3fe0a04 SHA-1: 759b4d20b1acd57d2f3595628f8a2fae00c936d4 SHA-256: dd4ff553515b30813a76318a441e10b3b3ce52effdad5b200fdf29c330234fd5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

The PDF contains numerous external links, many of which are dynamically generated and point to potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The 'SE_FAKE_CAPTCHA' heuristic suggests the document's content is designed to deceive the user into performing an action, likely to download a payload or visit a phishing site. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://kuzutuzo.ru/wix?keyword=ucf+dependent+verification+worksheet
    • http://podarokinsta.online/poponkea6j.pdf
    • https://cdn.sqhk.co/sejarepezibo/jgrggic/vr_horror_videos_free_download.pdf
    • https://cdn.sqhk.co/lomokubaf/igvggsb/1010_colorado_street_austin_tx.pdf
    • https://cdn.sqhk.co/tuturuno/liadwhe/52277688699.pdf
    • https://cdn.sqhk.co/tuseliwi/SIicgen/bukusopubatugoxevoxigodiz.pdf
    • https://cdn.sqhk.co/wuvexudid/hjeif8m/octopus_garden_beatles.pdf
    • http://sodaapp.club/ditamemopoxepikugakomezev6su5e.pdf
    • https://cdn.sqhk.co/sewuvavimebi/IfjeMjj/torn_meniscus_surgery_cost_with_insurance.pdf
    • https://cdn.sqhk.co/kixagixupo/iVMmjiI/crossfire_hurricane_song_meaning.pdf
    • https://penoruzeni.weebly.com/uploads/1/3/4/1/134132400/rotolozaroxovetig.pdf
    • http://palikexifumalam.mywebcommunity.org/bamexemeb.pdf
    • http://pakizimavom.scienceontheweb.net/26617775747.pdf
    • http://umkatrade.ru/xuwuvunamewopyh1.pdf
    • https://cdn.sqhk.co/gagobuniponi/8giBdDd/plants_and_animals_worksheets_for_grade_2.pdf
    • http://rafupufubed.mypressonline.com/mind_reading_books_free_download.pdf
    • https://cdn.sqhk.co/dobusalebed/gfpogj9/42474307580.pdf
    • https://cdn.sqhk.co/gogefaman/bgdijge/pocket_racing_guide_kiwami.pdf
    • https://vuzigalami.weebly.com/uploads/1/3/5/9/135960382/dfcf5cd0b.pdf
    • http://bazunujovi.scienceontheweb.net/the_beatles_complete_chord_songbook_hal_leonard.pdf
    • http://rabizepafuxonag.mypressonline.com/physical_science_textbook_grade_9.pdf
    • https://wavupuzubeje.weebly.com/uploads/1/3/4/2/134235525/vigujegu_rebuze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dozore/2009_jeep_grand_cherokee_srt8_performance_parts.pdf
    • https://s3.amazonaws.com/zurovajij/mosobi.pdf
    • https://s3.amazonaws.com/figidireki/94249853507.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_off0000fdcd.bin
81628eac31c614d45de09dc0ce3509d902d056135bc6fb1275c80fe02305282d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 5416 bytes
font_01_sfnt_off00011058.bin
44a65ec8d0e0751390a567b41a2fa22fffc41d367baf8974c5b8f978852d76d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11058 10664 bytes

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