Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d191d836c0a13a…

MALICIOUS

PDF

78.3 KB Created: 2021-03-16 20:57:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b8d313df07262b9b5d65d911fc831c6 SHA-1: e1dbfba9f9f8d674d686a1fae902364347f6f21b SHA-256: 25d191d836c0a13a4ddbc30d4e38461220d2cb022e1b5034da335480f7d678df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or phishing operation. The primary external URI, 'https://resalured.ru/strik?utm_term=lds+primary+2020+talks', is likely a malicious landing page. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=lds+primary+2020+talks
    • https://static.s123-cdn-static.com/uploads/4380068/normal_5fed759e37db9.pdf
    • https://static.s123-cdn-static.com/uploads/4454424/normal_5fef89c38dab9.pdf
    • https://cdn-cms.f-static.net/uploads/4443814/normal_603c25655e784.pdf
    • https://static.s123-cdn-static.com/uploads/4476123/normal_5fe26a9260232.pdf
    • https://cdn.sqhk.co/kaxejelun/1TFgdgf/santorini_hotels_with_private_pool_oia.pdf
    • https://cdn.sqhk.co/jogepirar/5whjjeu/amazon_seller_support_contact_uk.pdf
    • https://static.s123-cdn-static.com/uploads/4445881/normal_5fc73a94ae97d.pdf
    • https://cdn-cms.f-static.net/uploads/4367903/normal_6044ae799aef2.pdf
    • https://cdn-cms.f-static.net/uploads/4478670/normal_5fd62fc8bdabe.pdf
    • https://static.s123-cdn-static.com/uploads/4421056/normal_5fe5720ca2e88.pdf
    • https://cdn-cms.f-static.net/uploads/4376600/normal_6012dd6d3bfc8.pdf
    • https://cdn-cms.f-static.net/uploads/4413563/normal_603d378874787.pdf
    • https://cdn.sqhk.co/gazegarov/hgifxhj/jefixomaxegusenajepesugu.pdf
    • https://cdn.sqhk.co/zijigemeworu/drhfYmL/modomulasisoxurukajorajip.pdf
    • https://static.s123-cdn-static.com/uploads/4366045/normal_5fe23e713a607.pdf
    • https://cdn-cms.f-static.net/uploads/4403960/normal_60257a1f88c60.pdf
    • https://cdn-cms.f-static.net/uploads/4452392/normal_5fd7b533cbb33.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0f939073-77d1-4307-aaa8-42539c8515e3.filesusr.com/ugd/85c9df_8534f4ebd61c4e9bb66cd1a3d226f737.pdf?index=true
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_2979ee202750492fb45358bba9a935bd.pdf?index=true
    • https://f4e740b0-69d0-4d5c-a0c7-362dc6b2ad6d.filesusr.com/ugd/0356fc_b8e835bbf9d34c569f143f23bfb2b85d.pdf?index=true
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_b0f27dd717f445558df90f48f454e0b9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fc35f337-c77a-41f1-9943-b30f16556377/36159530260.pdf
    • https://uploads.strikinglycdn.com/files/d0fb3c97-7822-4674-bc99-14cce3fd989d/tefuxarejitile.pdf
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_c7e0e1dfca7c46529f8f89536ceb3cb7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e29bc3b4-822e-442a-9cb6-9410642e5670/99321341439.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f61c.bin
489c661a1f4e7efc42ea80ae661f1420b8cc4fa2f6ae191ef9b829a026807da5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF61C 5484 bytes
font_01_sfnt_off000108b6.bin
57352a34d1eefb9aee36796fb78c4eeed8ed34c261e190a3883e06a515ba2eee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108B6 10356 bytes

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