Malicious PDF — malware analysis report

Static analysis result for SHA-256 769d64b86011cc02…

MALICIOUS

PDF

45.0 KB Created: 2020-11-06 13:14:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 950067a836cd39f6ff8f909149a1fd1a SHA-1: 11b579536a0b3094e1d0ad22bb8d6bd21caf1d9e SHA-256: 769d64b86011cc029717574da26633aed5877f722d834ab6e57c47a4d4dd61cf
96 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 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 1.0000

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://trafftec.ru/123?keyword=benzoin+condensation+yield PDF link annotation
    • https://gugabezari.weebly.com/uploads/1/3/4/5/134577353/widexelan.pdfIn PDF document text
    • https://pitimonajavigo.weebly.com/uploads/1/3/1/3/131383860/zekotu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f99ac134bc8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376606/normal_5f8c9eca6d786.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372399/normal_5f8886c832f6b.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/b4ef2ea0-1ef6-42c3-8838-4583959633f0/7772693558.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81bb5a2a-9d70-4065-9290-07242f4e7b01/gabesinafevesedex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74b9f7ff-4a98-4b9b-9ac3-c4a7a34f19a2/kafakuvifavo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/977aa699-4f1c-426b-9c3b-50328b1f91b8/76687750788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16c1f135-2c3f-4251-b188-5ef06db64dc1/killer_life_4.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/polipisufakebewupemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5105f54b-69c0-4767-b863-f839894948cc/mixenal.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/knievel_signs_flexor_tenosynovitis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/764952c9-cca0-4ee9-bf3f-054e92782c60/ceramic_egg_cooker_mac_and_cheese.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_off00006ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF9 5036 bytes
SHA-256: 659cae7cc329a0b50218293977caa7e849b42a6aa2484aee2dd0b91f02d59507
font_01_sfnt_off00008141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8141 11404 bytes
SHA-256: 792ee80fabc57cf48802e5f8e0378ebc622f425cc3e2f7aae61c4bb858b121ba

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