Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea1bb020b70a0599…

MALICIOUS

PDF

95.2 KB Created: 2021-05-30 04:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ba3e25616fc48c7401a84f504e328574 SHA-1: 55cf32da4a638e2eec0912bde430ab74dd183379 SHA-256: ea1bb020b70a05996284f84e8c5f8ce777176fd6e6312622f0a385d7d32ac7dc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external URLs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links, including one pointing to zajinet.ru, suggests an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://zajinet.ru/123?utm_term=safari+web+browser++for+windows+7 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427793/normal_603033796a146.pdfIn PDF document text
    • https://baputopozim.weebly.com/uploads/1/3/5/3/135336161/7558304.pdfIn PDF document text
    • https://feverawujebuv.weebly.com/uploads/1/3/5/3/135314909/mizidam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413967/normal_601b0bef541b7.pdfIn PDF document text
    • https://kinuguno.weebly.com/uploads/1/3/1/4/131454024/4216379.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505102/normal_6049034ac6592.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372085/normal_603c892ba6dab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408851/normal_6030eb12133f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480755/normal_5fc882e7a6d4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374708/normal_6039d08979266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446923/normal_602fe823a20e6.pdfIn PDF document text
    • https://guvopizap.weebly.com/uploads/1/3/0/7/130776702/pisujuluvi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451561/normal_5fdbd03ac4a01.pdfIn PDF document text
    • https://wirolarem.weebly.com/uploads/1/3/1/6/131636642/7422008.pdfIn PDF document text
    • https://wumaluruporemad.weebly.com/uploads/1/3/0/9/130969386/mofadexifu-dugoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489717/normal_60256bb441553.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416928/normal_6069dfe84e767.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403814/normal_606ea4289e2c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410956/normal_606bcdc81d8ad.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/69f3842b-7aa2-4725-98cc-a601fd5e77b6/international_cost_of_living_index_by_city.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a0455e7-9bf6-4e45-82bd-f48e3cd77e96/jikoxomosojom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a69041e-b8bf-4a4e-9eef-9b94d798d609/38904809923.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_off0001241f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241F 4992 bytes
SHA-256: bdd53b0682ed3d7c5a0aacc7108f8eb22206c1561be75081a6f9f4d5d8411980
font_01_sfnt_off00013527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13527 14260 bytes
SHA-256: 4c311b24f070a5b6b1aaaedb781efbaace84a3f5dee2dca53b363f2e0b1b1bb0
font_02_sfnt_off00016107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16107 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333