Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66f635b97faa11c…

MALICIOUS

PDF

94.8 KB Created: 2021-05-30 15:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c6b9189fe470dbe04e66fea54a9c4539 SHA-1: 458fea9fc29f72d6d1ef6be01ee303c087fb9599 SHA-256: f66f635b97faa11cf5cff87518009b80b965a7571b05129239bb3b61d5ccb876
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://botokaw.ru/123?utm_term=how+are+nun+buoys+marked+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471083/normal_5fc6aa31d9d8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450247/normal_6028a70d353ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464522/normal_5fcf9faaadbf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459029/normal_604c9836821bc.pdfIn PDF document text
    • https://jumewabob.weebly.com/uploads/1/3/0/7/130775497/tifupa-zazada-difonukogivu-dufolerul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493890/normal_5fdf9b2808347.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420260/normal_6019cd3dbbf04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422620/normal_5ff0f26e25dd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478402/normal_605484f405f03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420934/normal_5fcc2a2157e5c.pdfIn PDF document text
    • https://rixapuboxexegat.weebly.com/uploads/1/3/4/3/134348256/paponuget.pdfIn PDF document text
    • https://menaxogem.weebly.com/uploads/1/3/4/4/134432074/f50a6b67.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/20659.pdfIn PDF document text
    • https://gekibuvun.weebly.com/uploads/1/3/4/3/134354697/koxinuledipogeb-gedazezaxuw-pajowarogipav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417530/normal_6022e732a9a20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462708/normal_5ffa3b6a49e6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485010/normal_6003a583d4db1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413838/normal_5ff1c08655a1c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff0ebadb-6532-4386-991e-9083fae0fc02/shoei_neotec_2_for_sale_ebay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac9ca941-714c-4ef4-9286-885e7b78a354/tokyo_ghoul_season_4_explained.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34714512-6551-4d7f-95f4-0fc2b5fbb24b/the_crucible_act_1_quiz_matching.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d510db6a-f952-42cf-bca5-a25fea9cc19c/pantone_formula_guide_coated_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f090a8b-e643-43f4-801f-24cb8dab5a45/el_dador_de_recuerdos_ver_online_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ed8fdc0-d07d-4bb8-bdc2-7a96fc131f32/how_to_find_old_journal_entries_in_quickbooks_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9803db30-0eea-4da3-8c0a-6ed6e4976741/how_to_do_a_proper_email_introduction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63938c0a-364e-4739-9dda-2e142a4d6878/kubota_zd326s_owners_manual.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13503 5296 bytes
SHA-256: edb4c23a7ac1e29538cabcb68800c93c534d33759f1270b62a14b572705c5242
font_01_sfnt_off00014701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14701 11328 bytes
SHA-256: 67b7a8afc4846dd464c6cc44654d45799f1f3217b7a74721933cd8ce3ca0be80