Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d1c8c510d0730e…

MALICIOUS

PDF

67.0 KB Created: 2021-01-27 13:03:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8cdff7d4ed4e1e9ecc356cbf2cc7e4bc SHA-1: 37e3281a4ebf5c9586a1d576b60891df8cca62be SHA-256: 50d1c8c510d0730edad98eee3ce429c3ed3210f8e2cc974d04951d0159880edf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_URI' confirm the document's purpose is to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://baarspo.ru/aws?utm_term=microsoft+word+bookmark+template PDF link annotation
    • http://sijuvibitita.iblogger.org/39584107534.pdfIn PDF document text
    • http://terem.space/formula_3_2020_driversa5sor.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/HDcidQK/world_cup_2018_points_table_cricket.pdfIn PDF document text
    • http://excschool.ru/your_texas_benefits_form_h1010fmfgl.pdfIn PDF document text
    • http://eurofamily.pro/stuntman_ignition_ign_reviewirw1y.pdfIn PDF document text
    • https://vemegerefawobe.weebly.com/uploads/1/3/2/6/132682093/e82a7.pdfIn PDF document text
    • http://esmoney.site/23961693044f9t8.pdfIn PDF document text
    • https://cdn.sqhk.co/diridenafa/hfgdha7/retro_games_emulator_download.pdfIn PDF document text
    • https://cdn.sqhk.co/juvexafi/HjeCigS/rititabu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zunaporam/niwulamaferiduzex.pdfIn PDF document text
    • http://bavajozobe.epizy.com/45313578059.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/megapotodatixi.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/attestato_di_laurea.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/spotlight_single_bed_flannelette_sheets.pdfIn PDF document text
    • http://ronagipesi.rf.gd/72798481653.pdfIn PDF document text
    • http://bobujosu.epizy.com/journal_of_hepatology_case_reports.pdfIn PDF document text
    • http://tereralubo.epizy.com/85938406615.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_off0000cbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDD 5604 bytes
SHA-256: 92d959f7b2ca45fd8890402f72c9ba26b2166995d96e6d6949bde80a6132568c
font_01_sfnt_off0000deeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 9452 bytes
SHA-256: 696e94910700747052ab4993ab6dd13dbe8aeace576a34fadd878aa4a2e0f420

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