Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e1ed6be28ed4a2…

MALICIOUS

PDF

76.5 KB Created: 2021-03-09 20:44:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4214fa4f5c7df9f9be8de6ed4cffb0b0 SHA-1: b0e922aba0a884f2347d41a0f735c2a2ea8537f8 SHA-256: 91e1ed6be28ed4a246bbf2ce33f82473b2cd511fbc9c4358f48abe53e4ea4189
156 Risk Score

Malware Insights

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

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 0.9995

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://jottigo.ru/123?utm_term=enlaces+ionicos+covalentes+y+metalicos+pdf PDF link annotation
    • http://bigno.space/forex_price_action_scalping_volmanshmaz.pdfIn PDF document text
    • http://fofolep.mywebcommunity.org/sc_dmv_near_me.pdfIn PDF document text
    • http://thechambre.xyz/what_causes_a_washer_not_to_rinsebewzl.pdfIn PDF document text
    • http://ridunculus.com/kunuwewemeo7kp5.pdfIn PDF document text
    • http://nejupike.mygamesonline.org/7041098958.pdfIn PDF document text
    • http://vexetifiridik.mypressonline.com/58455858591.pdfIn PDF document text
    • http://eurozone.pro/walking_dead_s07e15_torrentz13oq.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/dorobukasawituw/15_meter_beep_test_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/jatatogijalagogikobuvu.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/56204576953.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/96031321832.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/travel_expense_report_template._xls.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/54765119729.pdfIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_2ad3af2086ea48ee9cd87e3f59c072e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/78299165957.pdfIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_0ea4ac86746344ef9a401c2f8849e0f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mudurixo/ruger_lc9_vs_lc9s_trigger.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/apa_itu_t_test.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/75218001408.pdfIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_924e2f9d49ba4ec6876e71339b2dba92.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kumasala/88619683694.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/tujajumimivuxugeponig.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_off0000e944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE944 5324 bytes
SHA-256: 662d10388bb3d6b5cee0620c5c413709244cfdd6a3fc6866fe3e60d859fec9f7
font_01_sfnt_off0000fb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB64 11912 bytes
SHA-256: 4eb850907273dfc34ef44907280c79b4a91330989ce7a53a02f6d8942f79f548

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