Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a47edef8b101ca…

MALICIOUS

PDF

65.1 KB Created: 2021-03-22 08:58:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 984d1c07f41085d3bea60abe1b367a7f SHA-1: faf6f18637c56f76e44502f82281fe51887711e3 SHA-256: b5a47edef8b101ca3a6e5a587359cd4990411aeebc6a096e3e8e488f929dc692
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO link farms or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the heuristic PDF_SEO_LINK_FARM suggest the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://seumenha.ru/award?keyword=wd40+safety+data+sheet+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4405179/normal_60058650f31e8.pdfIn PDF document text
    • https://fetepidema.weebly.com/uploads/1/3/4/6/134684810/danitekezibokakovaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456116/normal_5fd1e55ea9087.pdfIn PDF document text
    • https://mokizafot.weebly.com/uploads/1/3/5/3/135347773/dututogabotat_zileme_jexufezem_fivuzonam.pdfIn PDF document text
    • https://latafixewikokaj.weebly.com/uploads/1/3/4/6/134687196/jibaveku-jedasetig-jatuwu.pdfIn PDF document text
    • http://torevifij.iblogger.org/66145855056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375088/normal_6053b88ecf3db.pdfIn PDF document text
    • https://denibemexe.weebly.com/uploads/1/3/4/5/134597338/paxuvebamivinu_vafexer_kewixevekaluvej.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/ea70b509-7747-41a8-94a5-bd0c2d5457da/87198465311.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/factors_affecting_biotransformation_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/activex_control_vs_form_control.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/415bf665-f267-4976-ace8-a053dd888e74/tascam_us-4x4_price_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/arthropods_test_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/platform_number_10_new_delhi_railway_station.pdfIn PDF document text
    • http://xodubepegiluli.rf.gd/gunerinosanamutob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1910ec4e-554c-4a2e-af5b-79ee445dd4a2/will_concrete_cure_in_cold_weather.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e84aebf-602c-413f-8bf4-4be232aabe0f/97703715862.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/helping_verbs_worksheet_with_answer_key.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_off0000c448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC448 5344 bytes
SHA-256: 14d525648afb87f00d1674d8d365c1f1b25effe00d22e81a9d8cd2f82869fca6
font_01_sfnt_off0000d694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD694 9672 bytes
SHA-256: b57da22f15894ccaee418e1709ca58267d8e8a52003eabf6c355b981ca42ce97

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