Malicious PDF — malware analysis report

Static analysis result for SHA-256 763fc9851afd4950…

MALICIOUS

PDF

39.9 KB Created: 2020-11-06 12:07:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6fbeb44f8a6d0d3f098583675b4e3cf3 SHA-1: d372e40a838256dc4183c0a5ac3512bd320a45e9 SHA-256: 763fc9851afd495072960499297ad79de229e8b158914abd3517dd94a7926cba
66 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffset.ru/strik?keyword=transversals+and+parallel+lines+worksheet+pdf PDF link annotation
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/niwexekeropeveteken.pdfIn PDF document text
    • https://supidopize.weebly.com/uploads/1/3/4/5/134521205/94da9236644.pdfIn PDF document text
    • https://losepubi.weebly.com/uploads/1/3/4/5/134502138/2157219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372735/normal_5f991f356add8.pdfIn PDF document text
    • https://nonaxoboru.weebly.com/uploads/1/3/4/4/134467623/sawamamuzej.pdfIn PDF document text
    • https://bikojeril.weebly.com/uploads/1/3/3/9/133999271/9698626.pdfIn PDF document text
    • https://junafoxotoroj.weebly.com/uploads/1/3/0/7/130738975/kugixugewerabufu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9044/2917/files/34055968709.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df97bc34-7e58-4e64-a699-8a01a8225456/tableau_2019_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a703f492-7fff-46a4-a8e8-8dfedb32c847/roxivavozopuxix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61f4edab-b8c6-470c-9a9f-7f944d78b791/la_vida_est_en_otra_parte.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/50034352151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e35f49c-b6df-4a97-b1de-b993af282432/zarigitiwawefulupovigubi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AB0 5292 bytes
SHA-256: ffb2812d96cbf15bb73f063c8d9791b0f4a0c67633cb2aebcc58c2c7c830b595
font_01_sfnt_off00006cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBF 11252 bytes
SHA-256: 877e5c5f4fdf21bd96ee118d65d91b7c0d96c28c3409fb0fa3002472f0fc72b5

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