Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4a4628942fc1e5…

MALICIOUS

PDF

77.8 KB Created: 2021-02-16 12:47:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d68aa8ec10c8b9fbf939e63fec30ddfc SHA-1: e049fed433841d9bf0d04b9ee60d9e941c7f960a SHA-256: 5b4a4628942fc1e5e4a0994e5c5fbdb467232ef679c51042d221de7a0f032ffc
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of malicious URLs and the nature of the PDF heuristics point towards a phishing lure designed to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/123?utm_term=armstrong+furnace+pressure+switch+problems In PDF document text
    • https://cdn.sqhk.co/kibedutej/ejc9jfm/1163497476.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449793/normal_5fef9a4c19a55.pdfIn PDF document text
    • https://cdn.sqhk.co/tozimozeka/ZTjije5/jibejorumuvebe.pdfIn PDF document text
    • http://doctora.club/megetabh5zjb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501367/normal_5ffb54ece2cdf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489054/normal_5fcd6ba3e543f.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/kjeQicd/86809262109.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457849/normal_5ff2a18c61e4f.pdfIn PDF document text
    • https://cdn.sqhk.co/pigalixow/hCmgjW3/bexufepikiwof.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/folexapurilowe/css_code_annex_13.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/cisco_packet_tracer_free_6._0.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/fundamental_of_analytical_chemistry_book.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/clustering_in_r.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/50975617295.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/fidelity_international_small_cap_fact_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/visubepegutine.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/indian_rupee_symbol_in_word.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/nuloverusenudibelilezo.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/jisetuwasetarozoxidedimot.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/quartz_crystal_thickness_monitor.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_off0000f17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17E 5652 bytes
SHA-256: 1b0d18bb6e07ec79c7859d1a75b8aa3351af2dd10e03d5e42636b19e46ffaef3
font_01_sfnt_off000104a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A0 10728 bytes
SHA-256: a8b0741de9456957691cc375389abbba86d12ede4336c285741dd95f59179d8b

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