Malicious PDF — malware analysis report

Static analysis result for SHA-256 076b91a0f6507488…

MALICIOUS

PDF

73.3 KB Created: 2020-11-10 11:42:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a2696a4a836f20fd2b4db96049dbd207 SHA-1: db4fb8ccd0d8c22b65c0e29780b160906f3587f8 SHA-256: 076b91a0f6507488e7e40c9de4f13c1d1651320ed8d53a360d4651b0377b9e8f
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 0.9997

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://trafffe.ru/123?keyword=neurons+worksheet+grade+8 PDF link annotation
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/89b144215.pdfIn PDF document text
    • https://jegolufu.weebly.com/uploads/1/3/4/6/134677495/kotutowuwalulod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453129/normal_5f9fd1ddbe26d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380858/normal_5f90c7b215f68.pdfIn PDF document text
    • https://bosizeke.weebly.com/uploads/1/3/4/5/134596703/valotapi-lukasesakijebaw-wuzewekar.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/a88ee629-eab1-44c5-a6b3-76dc4acdfe64/54824017622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a09f9bf2-b20a-498b-bbf3-af325b9358bb/nepabirojarusonob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/732e43d3-9939-4947-9c88-fbf5636c706c/principles_and_labs_for_physical_fitness.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cf22c17-a714-4200-bad2-228ffe95c2c2/98998986401.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/483dd63b-b277-49b4-8b65-a4991be2cac2/91720221946.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/185063570.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cc2c7c1-ddc6-450a-909d-039d19ed5593/65437965177.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_off0000c6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E6 8312 bytes
SHA-256: b3417d70c09ea6d687a7948a11ccec70efb35a35a0538777aa556e9be77b8e1c
font_01_sfnt_off0000e313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE313 5372 bytes
SHA-256: 8e74af52f51a8404f466f854f0abbc05803572d9cada36268f9f4512cb210b04
font_02_sfnt_off0000f567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 10264 bytes
SHA-256: 3e269a6ef3d806b4a7879747e1fc6fef31930cd4b076edddd4318f55db0c2537

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