Malicious PDF — malware analysis report

Static analysis result for SHA-256 6578f4f6aa68a364…

MALICIOUS

PDF

81.1 KB Created: 2021-05-19 04:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 404c501625abe735ddf115ab3e73d9f0 SHA-1: 699847d5f381c3cb858f408c38732b6a5a6ca5d1 SHA-256: 6578f4f6aa68a36495c9aec6c146375291cbad1ce37206294b92184e1c5bbe48
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' confirm the document's purpose is to direct users to external, potentially harmful, web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://fokemale.ru/strik?utm_term=2015+dodge+charger+repair+manual+pdf PDF link annotation
    • https://nitowapesapu.weebly.com/uploads/1/3/4/4/134442046/f07ce7d2a0e43.pdfIn PDF document text
    • https://tisuzozolida.weebly.com/uploads/1/3/6/0/136087901/gegenivezimoxotimani.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368249/normal_5fcdc9c47e4f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387040/normal_600504d9286ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528260/normal_606ba6a14b5b7.pdfIn PDF document text
    • https://retizobokeli.weebly.com/uploads/1/3/1/0/131070240/zabak.pdfIn PDF document text
    • https://xuzopodoker.weebly.com/uploads/1/3/0/7/130738955/kopununeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387810/normal_602be18c06098.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462046/normal_5fc7ad5c39a9e.pdfIn PDF document text
    • https://wofogubegir.weebly.com/uploads/1/3/4/7/134728038/b7b9fce2f.pdfIn PDF document text
    • https://tokomekenipejo.weebly.com/uploads/1/3/4/4/134441443/xuxowerizodiw_morudixodip_zulokunu_nokupusiwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368244/normal_5fdc498a477f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497638/normal_60592468cd217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484365/normal_6050e2ac86300.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470543/normal_604ad1a38b277.pdfIn PDF document text
    • https://ralokokotozupar.weebly.com/uploads/1/3/4/3/134340958/0de7b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383128/normal_6054320189acc.pdfIn PDF document text
    • https://buvefejam.weebly.com/uploads/1/3/1/4/131453018/1922118b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369185/normal_5fee0ed7be405.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/07b78379-a491-459a-b4bf-36ebfc2d50f6/bissell_proheat_pet_12_amp_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f796ce0-9bd4-4ca4-bd3a-141f2dc32c3f/the_brief_wondrous_life_of_oscar_wao_chapter_1_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1c5e0c8-4f3a-4a49-8e3d-8a62d1ad6d63/nuvemenisovomugoneturik.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 5548 bytes
SHA-256: e5039362f272ab440a35bc41b08e66f5512f896ee388dd25932bd1f2f4e0643c
font_01_sfnt_off00010386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10386 10940 bytes
SHA-256: 6ed471b7b7e3267f03c6df99acc8cfc83409047032186fb2483a5d3e904ae074
font_02_sfnt_off000128ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AE 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333