Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ec6e00f731601c…

MALICIOUS

PDF

84.8 KB Created: 2021-04-13 06:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bb7c8034513f7d4eaba5a7daa6b0bb83 SHA-1: 3c4850e2516b5ac61b37c06bfb9b143b298b6a1d SHA-256: 43ec6e00f731601cf206401ebc596e562c16276e09711f1f56114f6e07a7d91b
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 direct users to malicious content. The ClamAV detection and ML classifier strongly indicate maliciousness. The embedded URL `https://soxebez.ru/strik?utm_term=how+to+repair+samsung+top+load+washing+machine` likely serves as a lure to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/strik?utm_term=how+to+repair+samsung+top+load+washing+machine PDF link annotation
    • https://puviguwa.weebly.com/uploads/1/3/0/7/130776677/71c09d38421d.pdfIn PDF document text
    • https://fokakumunimu.weebly.com/uploads/1/3/4/2/134266115/sufirupi.pdfIn PDF document text
    • https://tuzutetenufiro.weebly.com/uploads/1/3/4/7/134716615/nefabo.pdfIn PDF document text
    • https://vizazoxo.weebly.com/uploads/1/3/4/6/134600102/9931706.pdfIn PDF document text
    • https://rirulejirosajis.weebly.com/uploads/1/3/4/3/134320684/webokodob-zilavabav.pdfIn PDF document text
    • https://womerakuketuzal.weebly.com/uploads/1/3/1/8/131856195/zovip.pdfIn PDF document text
    • https://lidawoxijotixi.weebly.com/uploads/1/3/4/6/134659122/2c173615c46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409255/normal_6016f50daf099.pdfIn PDF document text
    • https://mirajaxudedina.weebly.com/uploads/1/3/0/7/130775596/xuzesuvafubanijefolo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475406/normal_602da9d98e4c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420037/normal_60121d1be85e4.pdfIn PDF document text
    • https://tiledumojamusej.weebly.com/uploads/1/3/4/0/134096308/pakolakudowim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_9f23c26ff5fa4f3fa890874cef0e848a.pdf?index=trueIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_0e42b4df18904950b72cc3c4754f129a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/can_can_music_sheet_flute.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/antique_olive_roman_bold_font_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ec8e1a5-8a5b-4d5d-bde9-22b735f7d5ad/6442307013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/848c2ebc-cbb7-4381-a14a-c3df17a860c7/tulebiwasodi.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/teaching_transparency_worksheet_cathode_ray_experiments.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_off00010f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F97 5540 bytes
SHA-256: 31babded516e8daf509c02cf7215a738893d970be015b798f3a17a285e2517d1
font_01_sfnt_off0001224a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224A 10376 bytes
SHA-256: 7fbae4600259007afead082a53a38ac3a262336a2d7e930842405fff5f9b7555