Malicious PDF — malware analysis report

Static analysis result for SHA-256 65243f71d7861fb2…

MALICIOUS

PDF

73.2 KB Created: 2021-03-01 05:59:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2eb8fd0b5ee9445f4a292b33fb2501a6 SHA-1: d53e2cb8f755d75ea4ec4e51a61a259f1bf42ea2 SHA-256: 65243f71d7861fb2e047be56fef37c3f42fc0387f0f3769cdf092add05e0eb11
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious content or phishing sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting a malicious intent.

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://resalured.ru/strik?utm_term=heat+transfer+%25283rd+edition%2529+by+mills+and+coimbra+pdf PDF link annotation
    • http://lulopoboxefon.scienceontheweb.net/pokaseduxafubarapawa.pdfIn PDF document text
    • http://werenntaq.online/jack_lalannes_power_juicer_model_cl-003ap_whiteoxy9u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417519/normal_5fda73b4c007b.pdfIn PDF document text
    • http://thecet.xyz/zekiwisuo3tcz.pdfIn PDF document text
    • http://badgesverified.com/one_minute_manager_book_online7s1l3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408180/normal_6034040c2621c.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/how_to_reverse_search_image_google.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459036/normal_5fc5f7f90704e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386837/normal_5ff5242ecc470.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zijiwaras.onlinewebshop.net/how_to_calculate_ending_inventory_in_units.pdfIn PDF document text
    • http://gevejonitu.onlinewebshop.net/ladovosipofixefodo.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/wedabetenimotezenojajejew.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/98587558156.pdfIn PDF document text
    • http://bexukavibume.myartsonline.com/16297549704.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/96096073289.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/89672725407.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_off0000de6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6C 5824 bytes
SHA-256: 2ce80bdd02fa7dea9eb63cdb15f7be5494d2371ff3cea42a79b003bf60b96d2c
font_01_sfnt_off0000f23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23A 10948 bytes
SHA-256: 1fa9de43bfae23ef4e7a378687c12b99f9cdbff84f425b0a0e58e801fb3a8d85

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