Malicious PDF — malware analysis report

Static analysis result for SHA-256 9978367e946c91e5…

MALICIOUS

PDF

45.2 KB Created: 2020-11-08 03:36:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 68612f3d45d7124a6d4ec94ca69d3bfd SHA-1: 23261b6781274ba7fe2b4b1299108107d67bf89b SHA-256: 9978367e946c91e5e6173cb743a794c34cac1c6f1e6f86fd4020aa8255947a52
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/123?keyword=2020+tax+calculator+estimator PDF link annotation
    • https://xufiwelak.weebly.com/uploads/1/3/1/1/131164558/gajawobedinubakodun.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/dofomujupaxilu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380088/normal_5f95a4cf3340c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://sevuropigo.files.wordpress.com/2020/11/gli_indifferenti_alberto_moravia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62b698fa-7b1c-4fac-9363-8d5de665c5e7/28439760683.pdfIn PDF document text
    • https://nuvuraxu.files.wordpress.com/2020/11/atmel_studio_7_arduino_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3563cf3d-3b9c-4d45-a84d-bc8a24d25179/posoninajarenepufuto.pdfIn PDF document text
    • https://manetomimexa.files.wordpress.com/2020/11/68091325827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aca536c9-9bcb-42f4-80c3-1a60f2b0c175/zudadoju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fd3bd2d-2e6c-491d-906b-ac93a35f8c05/90989625632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0378d482-aae2-4ddb-9dfe-48e7ef898ae5/moxumoledanaxaliki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/797b5031-06d1-4da4-a30d-526c35974d6e/similar_polygons_worksheet_answers.pdfIn PDF document text
    • https://pomobuvumedu.files.wordpress.com/2020/11/corel_draw_x8_serial_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13b47ba4-dbfb-4c71-ab39-b3b3a5ce5347/rinopiresufekosokogugene.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_off0000719a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x719A 5192 bytes
SHA-256: 2d364da97a4d2309953ca2252ca716c71953f53a575026f81deed8ee244bf533
font_01_sfnt_off0000832d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x832D 10904 bytes
SHA-256: 214e5a6b5fef7f6b720ea7d4f5d22d6f2a08716c0268c6a85dfa072eba94ff19

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