Malicious PDF — malware analysis report

Static analysis result for SHA-256 31aac34f4062a8f6…

MALICIOUS

PDF

72.6 KB Created: 2021-03-29 22:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e668f2623a83228eff953ab2a8da255 SHA-1: 7f62b933fbe7319c1b59a9afdb1f9e0735e1c423 SHA-256: 31aac34f4062a8f618f27aadaeb5d646d6776b8d7bf8bf85aea9c2ca30101e03
156 Risk Score

Malware Insights

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

The file is a PDF that exhibits characteristics of a link farm, with numerous external URLs embedded within it. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting a malicious intent to redirect users or manipulate search engine results. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/aws?utm_term=jamaica+clipart+free
    • https://jadozuvar.weebly.com/uploads/1/3/5/3/135312187/porezejokurevejak.pdf
    • http://werenntaq.online/10395350538k6vyk.pdf
    • https://cdn-cms.f-static.net/uploads/4495037/normal_602d29e6e03f1.pdf
    • https://cdn-cms.f-static.net/uploads/4369323/normal_603a0221b340d.pdf
    • https://kitedagipan.weebly.com/uploads/1/3/4/8/134892955/fivixekidapu.pdf
    • http://busibear.com/9427296574h9l1k.pdf
    • http://hellochildren.online/rivijudabafirantcxgn.pdf
    • https://static.s123-cdn-static.com/uploads/4477164/normal_5ff3c05cb8033.pdf
    • https://cdn-cms.f-static.net/uploads/4470521/normal_600be266d6c37.pdf
    • https://gajokemijibefe.weebly.com/uploads/1/3/4/4/134467094/miwotegifuzinuzigas.pdf
    • https://cdn-cms.f-static.net/uploads/4420454/normal_5fe63941921b3.pdf
    • http://wildber.store/is_gre_quant_easy1y8rt.pdf
    • https://nisaxiguxizi.weebly.com/uploads/1/3/5/3/135306566/9857127.pdf
    • http://avit0.cc/ikea_desk_legs_amazon4r4u0.pdf
    • http://allerop.xyz/humminbird_fish_finders_at_cabelasrbrbi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_56ede09c82db4b23bddea26b3dbcc32f.pdf?index=true
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_73e261e8560040eebab23e1217391c76.pdf?index=true
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_6347207d86e942e18877cdb366b1761a.pdf?index=true
    • https://d5aacb37-8766-4234-9cc8-c2ec3b911aba.filesusr.com/ugd/1e723b_7bee61af16e2432c9186664abbe3a1bf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0614f948-0b46-415a-972d-8924a90a2ef2/fomirova.pdf
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_af885e6526184de692ed069956128740.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8d94fbea-3787-421e-af36-6ea996fe3f77/firehouse_steak_and_cheese_sub_nutrition.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_off0000de00.bin
fc64e7e22e7dd748d649950f588ab13107c62234f4be945e93dc3ee4a78dd7a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE00 4972 bytes
font_01_sfnt_off0000eed9.bin
5f96900c9e724bbe93006c00b8c3787108f264a59a0a41d98bfdf62c56b18d1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEED9 11436 bytes

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