Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e59654bf174ec4…

MALICIOUS

PDF

84.7 KB Created: 2021-03-14 04:42:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eb96ca19ccc3e2ec41ebd203d67d6249 SHA-1: 53fad34c0c0f059c45ca0c83e4f0aa6593a8c53b SHA-256: 65e59654bf174ec4782613c3588be52bc94ca87fc8eabb938af5892385810e70
96 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 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 0.9998

Heuristics 4

  • 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=nora+roberts+books+by+year PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418199/normal_60250779c6b00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474736/normal_5ffcf51fa9992.pdfIn PDF document text
    • https://cdn.sqhk.co/temisexezoda/hi1ZggS/hamster_shelters_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387233/normal_6048459e10174.pdfIn PDF document text
    • https://cdn.sqhk.co/pugepavofu/cgvOieO/ufc_fight_pass_free_trial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369765/normal_6022d32a39556.pdfIn PDF document text
    • https://cdn.sqhk.co/romumoxoleno/2Xd6hex/juwuxipuxunof.pdfIn PDF document text
    • https://cdn.sqhk.co/xotakuzazuf/hctOBhi/color_fillers_for_blonde_hair.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485704/normal_5ff82ba574fc5.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/i2gfKqV/23453196165.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471253/normal_601b4b3841b90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454973/normal_5fe6446ad9ba9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416934/normal_60203fe701418.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_506694505e0c4fa39fdaf8682ca89f09.pdf?index=trueIn PDF document text
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_5783bced181749aa97f1447b49305a69.pdf?index=trueIn 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_off00011174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11174 4924 bytes
SHA-256: 2fb00bc49b1077fa1d3d83e574be2f3104e5dd4e2d725dbb807bff98d6a886ec
font_01_sfnt_off0001224f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224F 10868 bytes
SHA-256: 092ca3910f879af2a6a3b5278bf4ccf0a511b2a6383710625f88ac7996eb684b

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