Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1eca1e01062e27…

MALICIOUS

PDF

73.9 KB Created: 2021-04-25 20:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 332edbe804a9b7efabcac38ae4dcd0ec SHA-1: 1a46baf660811b2dea6e051606f53505f3ad90d9 SHA-256: 5c1eca1e01062e27829ae6866f5261bedcbe1bbab7c63dd6c940f5dfb76d9031
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URIs are indicative of a phishing lure.

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://pelibifir.ru/strik?utm_term=how+often+should+i+service+my+ford+ka
    • http://creditpm.com/nudumamov3mv3w.pdf
    • http://edevletorg.com/head_first_javaoo721.pdf
    • https://cdn.sqhk.co/furafurume/gd7Xyie/pumpkin_carving_simulator_codes_wiki_2020.pdf
    • https://cdn.sqhk.co/jarebomu/lKZvheh/logo_quiz_game_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4461505/normal_5fdc81cd912f1.pdf
    • https://cdn.sqhk.co/bopesajan/exBmsib/7111_island_village_drive_long_beach_ca.pdf
    • http://vopibuxipem.22web.org/90710520235.pdf
    • http://chebsvet.ru/vewitokaderewazuk92cn4.pdf
    • https://cdn.sqhk.co/zugeketinog/S61Pgi3/71878694890.pdf
    • https://cdn-cms.f-static.net/uploads/4404733/normal_6059efcad788d.pdf
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5fe920e9ad4fa.pdf
    • http://nubebukexowi.66ghz.com/lumivunedejof.pdf
    • https://cdn-cms.f-static.net/uploads/4455886/normal_6016c9874d1a4.pdf
    • http://dixitizer.22web.org/fikegodutiwomakosizalujav.pdf
    • https://cdn-cms.f-static.net/uploads/4367665/normal_601732f60c38d.pdf
    • http://valupimabo.22web.org/16282033122.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://runaredikulenin.epizy.com/diary_of_a_wimpy_kid_old_school_cast.pdf
    • https://uploads.strikinglycdn.com/files/3d589588-8b70-4ea9-9f32-e886f88e9b1e/80223031284.pdf
    • https://uploads.strikinglycdn.com/files/665d8c3e-3312-4309-b032-ef6567dc5c32/how_to_make_rice_in_aroma_rice_maker.pdf
    • https://s3.amazonaws.com/dazutun/hajj_and_umrah_guide_kannada.pdf
    • https://s3.amazonaws.com/jiwotarotavuz/a_canticle_for_leibowitz_chapter_1_summary.pdf
    • https://uploads.strikinglycdn.com/files/945b3f30-5a83-4955-8782-e4130f2ed2ba/models_by_mark_manson_book_summary.pdf
    • https://uploads.strikinglycdn.com/files/d0d8f471-90d4-4738-b0b5-27477c24e067/microsoft_wireless_mouse_5000_pairing_mode.pdf
    • https://s3.amazonaws.com/midizaxopazeji/group_summary_report.pdf
    • https://s3.amazonaws.com/gelawiweza/how_to_customize_magic_mouse_2_on_ipad_pro.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_off0000e40a.bin
0bb1a7b9f1408ee02afb2a46cf50cf7785b7b3335860d5afa386b3bdd015472a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE40A 5540 bytes
font_01_sfnt_off0000f6d7.bin
670e3d765c6621dec98d19d6f1f2532df1b18236e8ad2a0abb10580f9d5ee091		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D7 10316 bytes

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