Malicious PDF — malware analysis report

Static analysis result for SHA-256 64221ce31795ff7c…

MALICIOUS

PDF

74.4 KB Created: 2021-04-03 19:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3057bfa57c46d2aefe92b88afc3d4bf9 SHA-1: 979758a89a11ca95f465dad227ec406cd44ed7d6 SHA-256: 64221ce31795ff7c146857984b8ddf56f4ac1fadb61d2fddd7aa6613c2b9e4ad
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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=context+clues+worksheets+3rd+grade+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374703/normal_603cc4c5e79e2.pdfIn PDF document text
    • http://leadtop.co/94172333727ahodt.pdfIn PDF document text
    • http://apparently-home.com/dililumumoroduruziuqq.pdfIn PDF document text
    • http://motivawka.online/jasudetunapegejejg58v6.pdfIn PDF document text
    • http://motivawka.online/94600516842fy220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459057/normal_60550613a4251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460694/normal_60333e0fdc076.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_dc25c8ba99ff4f2e8b71f5f3ddc37b7d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e881d00e-1258-4f15-ba57-df59e06edb79/rikujeratizu.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/mcdonald_s_menu_nutrition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d6d42ce-5cc9-4151-94ed-387675c536ea/high_yield_topics_in_surgery_for_neet_pg.pdfIn PDF document text
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_bb5cbb0452ee40889d4a7c1d5df40f35.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/m_s_c_ka_full_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70747d29-795a-4d4b-b9e2-76825ee873c2/89433442284.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/25170211172.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/best_free_android_barometer_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/614f8bea-66ea-4e44-9cf6-e3f49ddccc9e/malej.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/weather_report_kolhapur_maharashtra.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/40183614537.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/epson_wf-3540_ink_cartridge_not_recognized.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_off0000e3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CF 5708 bytes
SHA-256: e4a59cff857eb91b4c4bbf3bfe191537122d53eca2fdbf7b650b9083018ea474
font_01_sfnt_off0000f748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF748 10980 bytes
SHA-256: ef368ef57a9bd1a46407d794cb00c1a6c7413985292a2716974766ae4ef7bc32

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