Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3f5cd1be06c12e…

MALICIOUS

PDF

75.6 KB Created: 2021-02-27 23:31:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 6fb1995883dc2f131f3ba6373a1603b9 SHA-1: 814bb12e8d60218baa6b315a31a331b8eeffa5b5 SHA-256: de3f5cd1be06c12efff5f07d3e645a462d014cd543d987721b75fbb134e83307
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains a large number of embedded URLs pointing to disposable domains, characteristic of phishing or link farm attacks. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to funnel traffic to potentially harmful 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 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://dugedepap.ru/strik?utm_term=fios+quantum+gateway+router+g1100+specs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486550/normal_5fc5cccc81cf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423757/normal_601a4b385ffa0.pdfIn PDF document text
    • http://myluckybet.xyz/organic_chemistry_questions_answerslear7.pdfIn PDF document text
    • http://maxist.ru/machine_liker_2020_apk_download6p6rz.pdfIn PDF document text
    • http://umkatrade.ru/gexozixvrkju.pdfIn PDF document text
    • http://mirror-x.org/85728764681pwb3s.pdfIn PDF document text
    • http://mebets.xyz/xoxomixufutaresez3gdv.pdfIn PDF document text
    • http://csxmoney.info/kogitomewivalubf0ql.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494166/normal_601d0a83d2fa1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419626/normal_60174e509db4c.pdfIn PDF document text
    • http://negozio50sconto.info/python_for_beginners_full_courserdd69.pdfIn PDF document text
    • http://samelike.site/galotesadisadirkw2m7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366407/normal_5fe51b8c07909.pdfIn PDF document text
    • http://cpskras.website/le_journal_echouroukmcfra.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 5692 bytes
SHA-256: 5ffbeb244bedc8c542bbed14af4f12f77f632c6e61921b68932019adfb548a5b
font_01_sfnt_off0000fc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC78 10808 bytes
SHA-256: a0488aa064d37f99622e507caa3ae14d7e4dea0a5ee95172b7f60fe148504b68

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