Malicious PDF — malware analysis report

Static analysis result for SHA-256 b505c6f441f35302…

MALICIOUS

PDF

73.2 KB Created: 2021-03-11 12:24:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d3d86d54c72368d5c428f4b13f9d3237 SHA-1: fceb28ea52cc34cf3ebd528b648c1ef8861785f6 SHA-256: b505c6f441f3530298d0d95dc891c8d69bb9aefb9645e8c3faea33c865d15df6
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with a primary URL suggesting a lure for software downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external links point towards a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/award?keyword=download+software+pdf+to+word+pc PDF link annotation
    • https://bunosepe.weebly.com/uploads/1/3/1/3/131379858/3389598.pdfIn PDF document text
    • https://likixolokezixi.weebly.com/uploads/1/3/0/7/130738950/a05abc5debbfcf.pdfIn PDF document text
    • http://terogit.iblogger.org/diploma_templates_free_ppt.pdfIn PDF document text
    • https://xovamiwif.weebly.com/uploads/1/3/4/0/134096018/gixuzoperatowilepun.pdfIn PDF document text
    • https://lifezudo.weebly.com/uploads/1/3/0/7/130739479/071ee37f72876.pdfIn PDF document text
    • https://vuwuzujos.weebly.com/uploads/1/3/2/7/132712237/jefumufetet-tanavaxodi-vitodez-legutalefojuna.pdfIn PDF document text
    • http://pazadixokumox.sportsontheweb.net/vumaworotexu.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/zefumilugarufelonisemek.pdfIn PDF document text
    • http://rewetuxavix.mypressonline.com/xazenuxenisa.pdfIn PDF document text
    • https://mimoleratamofip.weebly.com/uploads/1/3/4/5/134500060/2069522.pdfIn PDF document text
    • https://feniwimaregodin.weebly.com/uploads/1/3/5/9/135993969/80ecd490b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b2e4a9-3fc6-46f7-834a-3d0a06a5ebc6/how_does_bitcoin_work_youtube.pdfIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_eb4f2e84d51a48d6aa49d8005d49684d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbc6fb30-654b-424e-ade1-a3ea66055fa2/active_listening_activities_for_middle_school_students.pdfIn PDF document text
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_1ad8bb11bef14009ad6cfcdc26b12335.pdf?index=trueIn PDF document text
    • http://godidab.epizy.com/infectious_colitis_treatment_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49502c39-31ca-4adf-964f-5a0ac6686425/aiag_vda_fmea_manual.pdfIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_5640b08206c24a5eb279d3c12f4af647.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aac1282-0db0-4701-9e53-08c548867841/mefawerajizomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fc31ef3-01f3-499f-a39f-817d3ff1d8ab/5903926810.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_off0000e1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E3 5240 bytes
SHA-256: 1e11980711424a67319b537a79f5c18aff104dc4955fc41666b0482039bfc9b9
font_01_sfnt_off0000f3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E6 10488 bytes
SHA-256: 0a617296992e9888b35f2e9d2727e74e62622ee347d7f7d306ae74a2077b1feb