Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7fa8137f0a3097…

MALICIOUS

PDF

78.0 KB Created: 2021-03-20 19:49:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 73f78c3025f8af336b6c780b4e6b8fdd SHA-1: 9a32473c4665b8e72c7bccc41617640a6dc4c913 SHA-256: fd7fa8137f0a3097797fabd2753baa164338700ac0cf5e3d296ae828fb6913a9
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9992

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://dafemum.ru/aws?utm_term=what+is+reliability+in+maintenance+engineering PDF link annotation
    • https://towoxaji.weebly.com/uploads/1/3/0/7/130740158/15b1d5.pdfIn PDF document text
    • http://xatitakuv.iblogger.org/nightcore_perfect_switching_vocals.pdfIn PDF document text
    • https://sefedajexoxoj.weebly.com/uploads/1/3/4/4/134479396/bakanatino.pdfIn PDF document text
    • https://zikegebuner.weebly.com/uploads/1/3/4/8/134856814/12f6197696542fb.pdfIn PDF document text
    • http://zikesopaza.iblogger.org/sinhala_ayurveda_books_free_download.pdfIn PDF document text
    • https://rogosibaf.weebly.com/uploads/1/3/4/5/134590501/1490478.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zibemusisuvimal.rf.gd/51071453412.pdfIn PDF document text
    • http://xarugutivi.epizy.com/android_browsers_with_flash_player.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/pokemon_black_walkthrough.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41732f13-328c-4aa3-9332-18a5cf01cd22/zexivafumev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97dc2357-ae16-498b-91f9-aa30679e6507/48340902988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aae28adc-f2e2-4fae-a16f-4e59ec536424/when_does_hillsborough_county_go_back_to_school_after_winter_break.pdfIn PDF document text
    • http://bujavajivedejin.rf.gd/types_of_literacy_skills.pdfIn PDF document text
    • http://vejojivusuze.rf.gd/catecismo_anticomunista.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/tata_sky_remote_app_for_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/where_can_the_book_of_jasher_be_found.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4a5585d-88f8-4b5c-9af6-e0444603054e/pilizebiloj.pdfIn PDF document text
    • http://lonozepugarig.rf.gd/najawiwa.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/pewele.pdfIn PDF document text
    • http://widafasamuj.epizy.com/lovaveguwojenugipesejil.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/ibm_cognos_report_studio_advanced_training.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec1a31c4-97c0-4fc7-9c0d-1c1bc6d3f013/how_to_reset_brother_hl-l2360dw.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/association_of_legal_administrators_salary_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/49456385768.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/moruzi.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_off0000f4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CE 5468 bytes
SHA-256: c0bf6bebef674f889e3cc26978615ad7ca389115ab6d1eec2046a2ca9139c044
font_01_sfnt_off00010752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10752 10280 bytes
SHA-256: 7dddfa42c06883f728212ee8d83f54249997b6255ab3047e7f41dbdf44d3d426

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