Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d22221f086eb34…

MALICIOUS

PDF

74.6 KB Created: 2020-11-19 00:49:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f95e500505ef5683a9ea8a1fa3e87875 SHA-1: de4e5ca3c05a944ae7f5205164ff074a668ce994 SHA-256: d4d22221f086eb349fe626acb082a9be7399f6c3d2575972388c2a26f1bcf191
104 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=antiparasitic+drugs+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444630/normal_5faba94c23e59.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/3250b5961ed1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384026/normal_5fa465e9cab94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418178/normal_5fa98abaecf06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377679/normal_5fb3d51e5261d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462732/normal_5fa800fb40bc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5f871152de258.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469128/normal_5fa4ad9810f8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_5f97966a1b26d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451955/normal_5fa7289844910.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/91ca91a9-e53d-4b20-892b-5465b39097b8/tifivivafiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a581f2f-a89b-4e9b-b139-f56103b570f3/32977429859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7be8c803-1a80-4a78-8ffe-21e8bca3c31f/wsop_hack_no_survey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6b1a60b-b097-49d3-9925-b0c5435ffd4f/m500a1_shotgun_operator_training_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbc9955b-4e65-4f31-8fc4-f5b80c8248e7/76841073475.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_off0000e730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE730 5280 bytes
SHA-256: 7ccb3ba41bb55c443cf1f2136605680db5c08693b1624e4690272a0d07ddf1db
font_01_sfnt_off0000f935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF935 10912 bytes
SHA-256: bc0fb3353aa53c8e56eb24a1b28eabf2b51c189480c9d35cc75e76c57401f63e

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