Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe9b3782309cb208…

MALICIOUS

PDF

124.9 KB Created: 2020-11-17 19:29:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 4b0ea7281689cbc336eb694e8f2209fe SHA-1: d30c6d9f831d4979e5ebddab6c38e2d6c079da65 SHA-256: fe9b3782309cb208929dcb3e91288b4df2587d12eb43fc7d9e1147e9446829c5
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://traffnew.ru/123?utm_term=autism+exercise+ball PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5f90e3ede9b69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379971/normal_5f8b164b77716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5fb2fe6c6a2c9.pdfIn PDF document text
    • https://gozivuwedigati.weebly.com/uploads/1/3/4/6/134612943/gixizuxolujexu-salatitijagijur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406456/normal_5f9ed496db76d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382958/normal_5f91fb2458505.pdfIn PDF document text
    • https://fevanigazotife.weebly.com/uploads/1/3/4/3/134376534/dekukuxuxed.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/dalava/bach_prelude_in_c_minor_free_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/thomas_calculus_10th_edition_solution_manual_part_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67986909-744a-45f1-b07e-7dfee71a53d2/toguluk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89bdf544-e9c9-4516-ba77-6e6a4f85e8d8/honestly_red_riding_hood_was_rotten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b975201-2b70-4dd5-9882-070e74438345/19741240901.pdfIn PDF document text
    • https://s3.amazonaws.com/ruletetunima/muvada.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_off0001ae19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE19 5144 bytes
SHA-256: 1db31861d61f15af6f5f98131459bcdfb38216b87f6be0d74eb8e8a95f03e6c1
font_01_sfnt_off0001bf84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF84 11408 bytes
SHA-256: be39dbe1f22410bd0fe3037a5f510ec5501d6dfdbe8103368c3c6f60b4bb4f01

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