Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ae964c02747d67…

MALICIOUS

PDF

66.7 KB Created: 2020-11-25 08:50:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bee596aec88db9ab8298c24135e8fe8b SHA-1: 7ec1e995e55f2c11572d4f4f2c7ae7fc6497fbf1 SHA-256: e7ae964c02747d6726ef942266127554a49162a6f2c03874b6b846d6ef5d3ead
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a heuristic indicating it is part of a link farm, with numerous external links, one of which is `https://trafffi.ru/123?utm_term=250gb+hard+drive`. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically phishing. The document body, though heavily obfuscated, contains references to '250gb hard drive' and 'wkhtmltopdf', aligning with a lure for a fake offer.

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://trafffi.ru/123?utm_term=250gb+hard+drive PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365624/normal_5f873a366788f.pdfIn PDF document text
    • https://sozipufejelaj.weebly.com/uploads/1/3/4/3/134352325/1925490.pdfIn PDF document text
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/40b808dd9b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f87d47f33615.pdfIn PDF document text
    • https://piloseweme.weebly.com/uploads/1/3/4/4/134491853/2934674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444623/normal_5fbdf6115bd33.pdfIn PDF document text
    • https://zulatikuwa.weebly.com/uploads/1/3/0/7/130776211/zidibafepapina.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/746d38e7-63f6-4417-8a1b-e5fec14f2dfb/18221573958.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/278b81d3-9623-463c-8eb5-10e90f53a079/armor_keywords_fallout_4.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/draw_conformation_of_cyclohexane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bb2e86f-0df2-41f3-8868-76925eb1825f/looking_out_looking_in_15th_edition_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0540ac5-815e-4909-8298-84c9806edce8/9652748319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18010474-a378-45f9-8da5-2da017733c60/texolulakesoluresijefenud.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_off0000c789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC789 5380 bytes
SHA-256: 1a015937bcc69bc3fbe924537df401189e142c18aa40286925d1ec4958572870
font_01_sfnt_off0000d9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D2 10776 bytes
SHA-256: eb053d9fc53b6fc6842a656a44038e47e5b580f747efcc16c05bb3621c3eb646

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