Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d4783f719a862d…

MALICIOUS

PDF

109.2 KB Created: 2021-02-25 21:19:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 795ae1b65a9263e3f5f8598ce5a092b3 SHA-1: 60a1f8d57feb416f43dbc093129ee9cfd33d5d07 SHA-256: 34d4783f719a862d9f9808a6b9b7e90321971488ca0dbc9cacf0c93d9d59f930
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-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/123?utm_term=is+sig+a+good+brand PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381759/normal_5fcce848c0c30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426971/normal_5ff05e14365f0.pdfIn PDF document text
    • https://bofubesal.weebly.com/uploads/1/3/5/9/135958810/aea405c.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/72501394552.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/what_is_the_best_way_to_store_iceberg_lettuce.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/78602160450.pdfIn PDF document text
    • https://melugazeso.weebly.com/uploads/1/3/1/1/131164252/woxudoj_penamofonaj_bubituzulin.pdfIn PDF document text
    • http://jusukigib.sportsontheweb.net/what_is_not_an_example_of_critical_thinking.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451737/normal_60047b6403d3f.pdfIn PDF document text
    • https://buniburus.weebly.com/uploads/1/3/1/6/131637527/4c04f99ac14a0b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xopugup/chemical_equations_practice_problems_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/kudubatewimuxusuve.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/sejudo.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/total_warhammer_dwarf_building_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/mopagazetezomoxexelidiloz.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/28280656359.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15367 5040 bytes
SHA-256: 6e4cfaf2ad41de3826c4c00c80bc32a46ac8b4d6c61dd82bd6afac629579f119
font_01_sfnt_off00016491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16491 14900 bytes
SHA-256: 09103e697fe6b55923228dae4143055aa68d75af1f1e6a2720c8823b0cdcb429
font_02_sfnt_off00019254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19254 16172 bytes
SHA-256: 852e0d6ce07a1db2e11154f4548aec4dc29a2cf073112f8b6a2b4be1be4894b3

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