Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e28d6a63b66f938…

MALICIOUS

PDF

74.7 KB Created: 2021-02-24 10:06:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 778f0cd8aaae0f431e042712589dbb3c SHA-1: 55f6f6921365198985591970fb8ca3bafc5f6c46 SHA-256: 3e28d6a63b66f938810b7a86761bbdfdd937b207bc2bcca2f8a553314da72647
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://jacksth.ru/aws?utm_term=silence+book+series+natasha+preston PDF link annotation
    • https://fanamavikere.weebly.com/uploads/1/3/4/6/134610997/pukodatax.pdfIn PDF document text
    • https://kusebavizekofuk.weebly.com/uploads/1/3/4/0/134098677/6534754.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409395/normal_5fdc53eb8a06f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374708/normal_600f86102f01c.pdfIn PDF document text
    • https://sikovoropis.weebly.com/uploads/1/3/4/4/134473700/91a9310af07.pdfIn PDF document text
    • https://xufalawat.weebly.com/uploads/1/3/0/8/130814535/majarijopo_luvipef_pipiraf_jefezasisol.pdfIn PDF document text
    • https://laregupofonel.weebly.com/uploads/1/3/4/4/134464195/1158340.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369329/normal_5ff25ba597302.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476418/normal_5ff6921a4ba81.pdfIn PDF document text
    • https://nokaxogu.weebly.com/uploads/1/3/4/5/134520383/f8a00943d43.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/592fc89a1c.pdfIn PDF document text
    • https://maladekokox.weebly.com/uploads/1/3/4/7/134745457/jegenu-sizufirato.pdfIn PDF document text
    • https://xemexavowud.weebly.com/uploads/1/3/1/8/131857479/tanavuvavelu-belazujuke.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/mexijegedakol/5011516614.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/addis_ababa_university_digital_library_thesis.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/2018_games_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/23225177950.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/business_card_label_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/angular_form_reset_errors.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_off0000d283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD283 5328 bytes
SHA-256: 47e25c1a7bf5b9a098cd447a105fab0144aecaf28ec7ecc350cdc9b14c425e46
font_01_sfnt_off0000e498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE498 10212 bytes
SHA-256: 1aa30b0d3b83b43d80a3192ad8a91262df58a62ce7d2e0bb67ccbc882fbbe2d9
font_02_sfnt_off000107bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BB 16288 bytes
SHA-256: ecdbe3208a19b3fd5b0be58269e45d8c08d955bdaabc317a3b7d85181c4cd4f7

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