Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c938e110f7ae42…

MALICIOUS

PDF

117.5 KB Created: 2020-11-20 02:06:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a3283bca315dbb72aadd7eef35e7255f SHA-1: 2295900c654905cef5abb691c4c3116e438fb47b SHA-256: c0c938e110f7ae425cbe38aa279c28992725352e81d9dcb2b67f4b9c7f9618a2
96 Risk Score

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 0.9994

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://trafffi.ru/strik?utm_term=honey+select+subtitles PDF link annotation
    • https://morekifozolil.weebly.com/uploads/1/3/4/3/134332894/3207225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428334/normal_5f9a9ddbe39fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391896/normal_5fb5c5ce0fffd.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/vofezonusojejox.pdfIn PDF document text
    • https://badipixurer.weebly.com/uploads/1/3/4/4/134456466/wokaxot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fosalizuzu/legal_internship_certificate_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/selilu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07154426-9e38-4c3f-b02c-ed284897b2d6/additive_and_multiplicative_inverse_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0d59bf9-8394-4343-aa9c-74c6faf53bb3/xuvozuzigijilopikuxuvunoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73b1ebc0-1c1f-45b0-aa4a-a4d2ce175301/sbcglobal.net_email_settings_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b37c549e-c443-4aa9-8548-80b42056e523/16610234671.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001855a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1855A 4572 bytes
SHA-256: fb57c0be74d2b453b577ff2033364fe4b801cbf80d4c128e875e1b91c9558587
font_01_sfnt_off00019500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19500 11032 bytes
SHA-256: cc2818d5ead5fa49ec4c084bf581ece8e9e0c1be345fb1a1857bcd0c7e367005
font_02_sfnt_off0001ba97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA97 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361