Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa0958e8f99ec9b…

MALICIOUS

PDF

74.1 KB Created: 2021-06-01 14:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: de83c8b05818ef795d55ab6ae54f0be5 SHA-1: e925c6519ed22b8a606e0a9e93d0cd239e9434c2 SHA-256: efa0958e8f99ec9b5e36c444443206a1aacb7f36aedf74809bc4814daa3da13c
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, which is characteristic of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The embedded URLs likely lead to malicious content or phishing sites, aiming to trick users into downloading further payloads or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/pbw?utm_term=how+to+speaking+better+english+pdf+download PDF link annotation
    • https://lenukanaferu.weebly.com/uploads/1/3/0/8/130873899/bojuxuvipil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445129/normal_603bf8662d5b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378853/normal_6010d5324b2f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374013/normal_602d70faf2d44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377414/normal_5ff67a4f3b47f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405953/normal_604b590da15c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413843/normal_606cc490b8a8d.pdfIn PDF document text
    • https://kojozoxilasa.weebly.com/uploads/1/3/5/3/135302893/a9c7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370288/normal_6021a2fd900b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_5fe9afd35e84f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425506/normal_605ee3086c104.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gajufabeke.pbworks.com/w/file/fetch/144423018/how_do_i_name_my_real_estate_business.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/f/which_greek_god_is_the_most_powerful.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e574590-769f-44d9-93eb-b65a7ac6c6cb/1993_toyota_pickup_speedometer_repair.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/sisematiravalewu.pdfIn PDF document text
    • http://xawaren.pbworks.com/f/6794128161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ecbb74e-d80f-48e7-9df8-395b10936afc/revubodavudupubudun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcab3077-96f5-4632-9d05-15b7923ca59a/tikibizamizibekewob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4be6fc47-7056-4878-8c22-e79a504bac7d/que_es_rentabilidad_financiera_en_ingles.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/f/rajifanovexanisemafezeku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c42e6ca8-bef8-47a2-a4e9-54b7f0a9ce9e/real_book_volume_3_2nd_edition.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_off0000e2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E5 5560 bytes
SHA-256: 475f9dea15655682320dd9f7c0a1abf74fe879c44482f0a62d1130a3855ad75f
font_01_sfnt_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 10736 bytes
SHA-256: ba3b1feeea27ec6540da58619ce537e82d3e9aacf0b96d1e057c949abb90134c