Malicious PDF — malware analysis report

Static analysis result for SHA-256 25144f5a6d71427f…

MALICIOUS

PDF

77.8 KB Created: 2021-05-29 06:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8441c3f9a4e9310b4d36f8a482dbe6a4 SHA-1: 506f3edaa3c9ac94fbb25079efa7553daa84d778 SHA-256: 25144f5a6d71427f338b99ec817c5c8820dfec09045ddee0d2828b2e614be13c
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 pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://leonvi.ru/123?utm_term=angular+material+datepicker+set+date+format PDF link annotation
    • https://pefoduzipim.weebly.com/uploads/1/3/4/3/134371740/jibonemu-zajewanadizo-faxuwo-dafoxuxemi.pdfIn PDF document text
    • https://vekukexulijoj.weebly.com/uploads/1/3/4/3/134397774/5057787.pdfIn PDF document text
    • https://gobodanugamo.weebly.com/uploads/1/3/4/8/134862857/xikojinot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375196/normal_601f0352eb87a.pdfIn PDF document text
    • https://wupovejiti.weebly.com/uploads/1/3/2/8/132814541/a544150f649.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4406787/normal_60b192da78b41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423699/normal_602641506c9f2.pdfIn PDF document text
    • https://woxavadegiw.weebly.com/uploads/1/3/4/9/134902916/ddd49aa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369307/normal_600b6e997f624.pdfIn PDF document text
    • https://bawejitomu.weebly.com/uploads/1/3/1/4/131438353/dezaleke_fafitokal_gusuraza_denivelo.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/25452a0c-9a3a-4a0a-880b-2de5842c1478/how_many_molecules_are_in_3h2o2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13491c17-9004-4446-bddc-d77d84ba3c8c/sword_art_online_progressive_7_manga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/491bbae9-273f-4463-8d9c-13bbf0b6a0fa/65766092624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaa421f7-cbbc-47e7-b049-05b7c8e6c52b/zamusemaximozudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/543098ee-3ea2-438a-9462-b3e59b75324b/49550582798.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e45434f0-998a-4b0d-aa7d-e6c47b993e05/98409150568.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8ea2819-38f2-4f0d-968d-5fb122c1be19/8028545120.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_off0000ddb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB5 5412 bytes
SHA-256: e3d36616d930b4b8d6ccfe3424a37ee44b8c4266926cf3719e4c5ea09792fd44
font_01_sfnt_off0000effe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 12272 bytes
SHA-256: 08dc1e71146528fd5d219d8cb25b9e141b0e3256477345a8bf8c4ffcbd710502
font_02_sfnt_off000119c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C8 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34