Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac237cfc21bfa268…

MALICIOUS

PDF

72.7 KB Created: 2021-05-31 13:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e3222d91c459d29234a45999119b8819 SHA-1: da9a3d32bdb9048d3f5d55f0ad65f4a9cf167148 SHA-256: ac237cfc21bfa2681e94058fbd417db0142d928f929dc87f6b606a994d9aae08
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of a PDF link farm with numerous external URLs suggests an attempt to direct users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics indicate a phishing or malicious redirection scheme.

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://ponafet.ru/strik?utm_term=is+the+exit+hesi+harder+than+nclex PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393763/normal_5ffeaa435cf5c.pdfIn PDF document text
    • https://wuwifure.weebly.com/uploads/1/3/4/6/134647121/dubosevora.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392472/normal_5fdb40c595cb9.pdfIn PDF document text
    • https://ragidogatekanex.weebly.com/uploads/1/3/4/3/134388076/6910737.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404512/normal_5fef139c34c8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443815/normal_6035f2ddbb0f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473041/normal_6054db770d88c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382952/normal_5febe041d1629.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489976/normal_5ff61ff4d16c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465707/normal_6056584028f3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365575/normal_600841e571df5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504554/normal_5fe9336cba178.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485157/normal_603d602b31095.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475565/normal_600a6ee5231e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383797/normal_5fc62f9df352f.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/deb8e033-440f-45a4-a2c3-24b083d1c48b/500_drawing_prompts_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7a24c35-de49-4022-84d4-fd9181d7aeb8/mafaxebexuvurikojufoduxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62528943-a42f-4e17-902f-8cd62babdd7e/xebuwuma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccaf8151-8f1f-42c0-8f80-c432b6ce2ff1/deginesifo.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_off0000df0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0D 5032 bytes
SHA-256: 6a6adc6dcdd335dce0470374a02d04051895ca3ff272b5e12518726cb523b228
font_01_sfnt_off0000f023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 11064 bytes
SHA-256: c8a33e98faf99f7da597b61d4fadf62bba9b6bd7d3b3f47aa40006a4f3d374a1

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