Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3b2a6c134fc747…

MALICIOUS

PDF

81.3 KB Created: 2021-04-01 01:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dd7cc727a9b1dc09d50ec575a260c0fb SHA-1: 746d5428560162d3f0c13e4ee79ce9b4ddfc31a3 SHA-256: 7d3b2a6c134fc74725121694d86cb159834d94e057c4dcbd60aa8d539d627e53
186 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 0.9993

Heuristics 6

  • 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.
  • 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://botokaw.ru/wix?keyword=xanathar%2527s+guide+to+everything+amazon PDF link annotation
    • https://cdn.sqhk.co/bitowiso/jvgd4hj/43500009369.pdfIn PDF document text
    • https://cdn.sqhk.co/mawedabe/chfZ33c/pifavo.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/presto_pressure_canning_instructions.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/43958984111.pdfIn PDF document text
    • https://cdn.sqhk.co/mepetiruzi/QgffmaN/55969404044.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/giRf029/39164912100.pdfIn PDF document text
    • https://cdn.sqhk.co/wudajelu/djjwU1R/two_dots_scavenger_hunt_answers_july_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471960/normal_606239ec4303d.pdfIn PDF document text
    • https://cdn.sqhk.co/saligoliti/iN5M8pS/android_online_multiplayer_shooter_games.pdfIn PDF document text
    • https://cdn.sqhk.co/nivabetaz/ggdk2id/tuzetizok.pdfIn PDF document text
    • https://cdn.sqhk.co/mivezifov/jjaFNoq/cat_urine_neutralizer_spray.pdfIn PDF document text
    • http://xilexevu.scienceontheweb.net/pediatric_regional_anesthesia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371497/normal_6007ed97651a5.pdfIn PDF document text
    • https://cdn.sqhk.co/xekixuzurim/iVCk2wH/editable_family_tree_template_google_docs.pdfIn PDF document text
    • http://xanevejesofag.mygamesonline.org/cetoacidosis_diabetica_y_sindrome_hiperosmolar.pdfIn PDF document text
    • https://cdn.sqhk.co/jalizovi/gdphcgg/super_bee_drag_car.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411944/normal_6009a916dbbd2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a53ce89-bba8-417a-9690-f56cd922e116/zijunupatelexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92d9a633-ebb0-4251-8282-b5eb23d19710/85079911129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f79523d-376a-4c5b-86f5-c2aa5baf50f1/lusubeloruwanuxobupive.pdfIn PDF document text
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_c3f6e592cb774bc69f74ef6715e3ea72.pdf?index=trueIn PDF document text
    • http://subogerilazelo.atwebpages.com/result_based_management_logical_framework_approach.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f42ef823-d2ec-4f19-a04e-40805d418a57/what_does_call_and_put_mean_in_stock_market.pdfIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_475870ae266a4497b32d97e2c157ad3a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/60f3987f-e013-41d0-8459-414d9ed15ead/36376490234.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_off0000fd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD55 5428 bytes
SHA-256: 11d37782563e5f17d98a46f90584d5628b04f281e72aee3165aea3c6bde05625
font_01_sfnt_off00010fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB5 11576 bytes
SHA-256: 78b39563b98d795874d1d14989b1b2691aa885b910762b763278dcf9c534850f