Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e472cc1c86f3391…

MALICIOUS

PDF

73.9 KB Created: 2021-04-01 10:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: fbbded97f30cf630f53c62e43ee5dfda SHA-1: e0e66c281165b092d5cff989c70e8b2d8b144a86 SHA-256: 4e472cc1c86f3391c811b52c1356da20f2f9329662886da3dec309799d8b97db
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to domains associated with SEO spam or potentially malicious content farms. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to drive traffic to these external sites, likely for phishing or distributing further malware. No scripts were extracted, but the overall structure and link farm behavior are indicative of a malicious campaign.

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 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://zajinet.ru/award?keyword=50+states+and+capitals+quiz+pdf PDF link annotation
    • https://cdn.sqhk.co/lefuwaregew/jiFedLo/how_to_make_a_neck_knife_lanyard.pdfIn PDF document text
    • https://diveziriluro.weebly.com/uploads/1/3/4/4/134447321/4761709.pdfIn PDF document text
    • https://cdn.sqhk.co/lixipadiwel/jeidhhV/neurons_in_the_brain_how_many.pdfIn PDF document text
    • https://cdn.sqhk.co/fejisedetu/hhjjgjf/rocket_line_throwing_apparatus.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwifemi/jfieLjg/three_kingdoms_online_battles.pdfIn PDF document text
    • https://cdn.sqhk.co/kilatelazobe/hIlldgd/logo_sticker_maker_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/mewidexe/Libgfig/drag_racing_club_unblocked_games.pdfIn PDF document text
    • https://cdn.sqhk.co/sewuvavimebi/fIJydid/chara_deltarune_jigsaw_game_puzzles.pdfIn PDF document text
    • https://vajasefa.weebly.com/uploads/1/3/4/4/134490273/kutomokubinugi-gufowivivilisoz.pdfIn PDF document text
    • https://cdn.sqhk.co/rogevuzazi/ehijdhi/42040218594.pdfIn PDF document text
    • https://cdn.sqhk.co/vomawoko/clF4jjd/67482100544.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421366/normal_5fd8557a0765a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414342/normal_5fecbd35ac590.pdfIn PDF document text
    • https://cdn.sqhk.co/tofegejij/hhcUAgj/color_tunnel_run_3.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/timeziso/how_to_read_bmw_fuse_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/oracle_database_12.2_end_of_life.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/41977455176.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/construction_company_website_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/transformers_barricade_mustang_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/venus_fly_trap_care_sheet_uk.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9D 5400 bytes
SHA-256: 3dbc193607ed67196461c3a9dcee701b50b0b32b463a61abc06bf0963fbcfba6
font_01_sfnt_off0000e01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01A 10660 bytes
SHA-256: bc80a3bea2a6505b42123964613def9229a7fcfe9daded0221da16272de81446
font_02_sfnt_off000104c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C2 16388 bytes
SHA-256: 0c82561ead172ac0e51412abe629b5944d5f81f469066018c017fef234fe4ba7

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