Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba59a61eff05c73…

MALICIOUS

PDF

72.9 KB Created: 2021-04-22 14:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 66241d5942410790b461e17a5704f927 SHA-1: 53dd669ec0ed2f878ca24ae4ceb227c443de1608 SHA-256: 9ba59a61eff05c7335d2d878fbce6375c2c87ea67f299c6d4057c085a3065ffe
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 0.9998

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://zajinet.ru/strik?utm_term=how+to+set+old+honeywell+thermostat+temperature PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/786d77fa-7484-4b62-aa74-416a251bc64d/70584153869.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/what_is_central_processing_unit_in_swahili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a6b6c86-d970-4b49-a2cb-00943f34d685/posigodidebofolasowarabex.pdfIn PDF document text
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_a24850afb13d4fd6a77910946bc11033.pdf?index=trueIn PDF document text
    • https://b9264059-5ce6-458a-812b-58b21e0c51d1.filesusr.com/ugd/9a3dc1_d5c0e4e316bc4bb99a9bbcfde0d90e9d.pdf?index=trueIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_444f7248812d4302b97fe75dae3ecacc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/ritemafunusifikepezep.pdfIn PDF document text
    • https://d45de9d9-8116-4232-9203-1b9506c390e4.filesusr.com/ugd/a69a10_59e4d77a6105467cb5041f83a9979515.pdf?index=trueIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_22fdc4e24abb465889a9a040ffb94840.pdf?index=trueIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_0dca16b6b6fa4de087055c18e06eb60d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/saxefi/zabimagusobili.pdfIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_5e16441d29be4d3a8a30bb891499cd3e.pdf?index=trueIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_040db7316d1c4653b9e181349f6dc3e2.pdf?index=trueIn PDF document text
    • http://nabiporemug.epizy.com/math_coordinate_worksheets_that_make_pictures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c4fb683-681b-456e-8dc5-a5b06d564c73/40826547445.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/javascript_format_string_template.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/chrissy_teigen_recipes_cravings_2.pdfIn PDF document text
    • http://bikumekomem.epizy.com/pre_algebra_formulas.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/cubs_schedule_2016.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_off0000e02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02D 5356 bytes
SHA-256: 004d74f69e25a3c0d8b95ef1f3179e650844fec07b1c470131b3b97120ef5adc
font_01_sfnt_off0000f240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF240 10504 bytes
SHA-256: bb5e96d4899803f04ba27282279e1f2e71844f9108002abbe2dd1edd41d3da5f

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