Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c15e36cd3057be…

MALICIOUS

PDF

104.9 KB Created: 2021-03-24 13:34:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7be8f50c2af2cfe3c0ee8985fd306b23 SHA-1: 7701281a08ad7ad8d01a7f7f0b761849f8d95a30 SHA-256: 41c15e36cd3057be27692099b5d3af34bae98930063ba758d783ace94b2c5d81
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to redirect users to potentially harmful sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/123?utm_term=bendy+and+the+ink+machine+game
    • https://static.s123-cdn-static.com/uploads/4416927/normal_5ff6104395fd9.pdf
    • http://ideaita.fun/nifevusowiruxoduli21e3h.pdf
    • https://cdn-cms.f-static.net/uploads/4424328/normal_601a77d1a8a38.pdf
    • https://cdn-cms.f-static.net/uploads/4411229/normal_5fdae7f9c3f37.pdf
    • https://cdn-cms.f-static.net/uploads/4412607/normal_605032d99c6ae.pdf
    • http://winclean-shop.space/sourate_ayat_al_kursi_traduction_francaiseui54.pdf
    • https://static.s123-cdn-static.com/uploads/4420775/normal_5fe22e96bb37f.pdf
    • https://cdn-cms.f-static.net/uploads/4459929/normal_603611a859291.pdf
    • https://nenogeva.weebly.com/uploads/1/3/4/6/134661531/jozires.pdf
    • https://static.s123-cdn-static.com/uploads/4424007/normal_6001423693b06.pdf
    • https://cdn-cms.f-static.net/uploads/4454303/normal_604a64d58a4b9.pdf
    • https://static.s123-cdn-static.com/uploads/4485929/normal_5ff2fe87ab3f4.pdf
    • https://static.s123-cdn-static.com/uploads/4448746/normal_6002b6f01147e.pdf
    • https://static.s123-cdn-static.com/uploads/4365998/normal_5ff113003d5f2.pdf
    • https://tiwedipetubed.weebly.com/uploads/1/3/2/8/132816066/xaxokajegimo.pdf
    • https://cdn-cms.f-static.net/uploads/4501654/normal_603c330f9b274.pdf
    • https://ganunuzarije.weebly.com/uploads/1/3/4/5/134518475/8535206.pdf
    • https://tuxemadoja.weebly.com/uploads/1/3/2/7/132712185/5605927.pdf
    • http://batut.space/59470291063fichh.pdf
    • https://kesafukiwunutab.weebly.com/uploads/1/3/4/9/134900694/fajenoxasilu.pdf
    • https://cdn-cms.f-static.net/uploads/4412159/normal_6027d5d9555b7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_51ffd2997a1946e99bdfe4ffb1761513.pdf?index=true
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_8f5fb453d0a243a28504f4435cfc372c.pdf?index=true
    • https://8ed7ad90-0d0e-491f-9c15-1f6cd5a61d18.filesusr.com/ugd/f1a804_a49f06209635407c9105835058831368.pdf?index=true
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_af25f4237bca4f658ebefda2eaabb841.pdf?index=true
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_6317d0492b2049f9b1fbcf90740fb7ef.pdf?index=true
    • 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_off00015a16.bin
2d11460e9dc316b51b3550ff98cd94259b38744716ae818f95901826934462d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A16 5264 bytes
font_01_sfnt_off00016be9.bin
b78eed8db6508c03a36e28bee821993b85d952ae8e5b93f4193b7028bdd0254f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16BE9 12540 bytes

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