Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33f5b2d0724e5cd…

MALICIOUS

PDF

75.4 KB Created: 2021-02-17 18:42:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: c0b16832d105b254ca8b5b2f65044436 SHA-1: 875fc5db149e4863a44fb3b950a7c626c84e6be8 SHA-256: c33f5b2d0724e5cddb1da9c27105937332088cfa3d82226ae9b2a4583bee7c94
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to a 'monitor card' which could be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://druttle.ru/123?utm_term=monitor+card%25C3%25ADaco+de+pulso+com+gps+garmin+forerunner+235 PDF link annotation
    • http://allostar.buzz/97682159581d5b2q.pdfIn PDF document text
    • http://oneplusonemain.xyz/exercises_for_the_feynman_lectures_on_physics_free_downloadahgk9.pdfIn PDF document text
    • http://lami-lashes.site/equifax_canada_credit_report_and_scorecohne.pdfIn PDF document text
    • http://afracheat1.xyz/xemiwarufubexavofifigabep7o5ki.pdfIn PDF document text
    • http://shoppermarket.online/96793427870abg39.pdfIn PDF document text
    • http://save50it.info/xuzegorowoxug5o9wk.pdfIn PDF document text
    • http://pro-komp-master.website/dazejedovuvaxovubilezugenz34w1.pdfIn PDF document text
    • http://mosdendy.store/xiluloa1v4g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ligulukeril.epizy.com/jodenaviwepol.pdfIn PDF document text
    • http://xovojiga.epizy.com/facebook_instagram_logo_vector.pdfIn PDF document text
    • http://bamemuwibe.epizy.com/nims_ics_100_questions_and_answers.pdfIn PDF document text
    • http://ribaxekag.epizy.com/62233200661.pdfIn PDF document text
    • http://jogubemiviju.rf.gd/55723651780.pdfIn PDF document text
    • http://vapanuwivodoj.epizy.com/diameter_radius_circumference_worksheet.pdfIn PDF document text
    • http://wulimazef.epizy.com/10737151363.pdfIn PDF document text
    • http://jimakobogugiwa.epizy.com/gevitox.pdfIn PDF document text
    • http://toxawilel.epizy.com/bl_ap_cp_home_csc_j7_prime.pdfIn PDF document text
    • http://sovezogodum.rf.gd/48226967392.pdfIn PDF document text
    • http://rusuxipek.rf.gd/2263005663.pdfIn PDF document text
    • http://fakuzilezozo.epizy.com/knowledge_questions_and_answers.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_off0000df98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF98 5956 bytes
SHA-256: af8f28e00780d69ba64656d87fb7f4a2a8928a8fa6118aca6bda51e6ddbf5478
font_01_sfnt_off0000f3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E5 12888 bytes
SHA-256: 5671d568f6e79a04a2c473a30a494a07c0743c2e39e4004cefbe82ece14b472f

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