Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bd97d244cfdddd…

MALICIOUS

PDF

71.3 KB Created: 2021-02-15 08:05:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d881d9252dce154ec8b908a61fc50345 SHA-1: dd77414b14224b2bf6a1cb80eba4928fdbf11ddb SHA-256: 55bd97d244cfddddbe800215519f9a2868c437d7893df39dcbe11e00991215c3
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to redirect users to malicious 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://seumenha.ru/wb?keyword=wasteland%202%20review%20game%20informer PDF link annotation
    • http://virenoveza.22web.org/6996272828.pdfIn PDF document text
    • http://xobukafa.iblogger.org/envision_algebra_1_textbook_answers.pdfIn PDF document text
    • http://iciko.xyz/workplace_chat_clientq9cve.pdfIn PDF document text
    • https://cdn.sqhk.co/vogoxaginoje/lmihjbL/ximixisub.pdfIn PDF document text
    • http://ses-sanobrabotka.ru/national_rail_senior_railcard_application_formek2lq.pdfIn PDF document text
    • https://cdn.sqhk.co/gixegusu/yXjcK0A/gartner_hype_cycle_2018_manufacturing.pdfIn PDF document text
    • http://laitlabs.pro/app_store_free_for_windows_10dlmjl.pdfIn PDF document text
    • http://nelitip.22web.org/certificate_of_authenticity_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394068/normal_6006ce8fbb380.pdfIn PDF document text
    • http://xtina.online/one_minute_manager_meets_the_monkeyjokgr.pdfIn PDF document text
    • http://mon-cmbretagne.best/join_clash_3d_craft_runneri7p4i.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/informe_final_individual_para_preescezy91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465392/normal_5fca0405703c4.pdfIn PDF document text
    • https://cdn.sqhk.co/nilamemiw/hjeVjcP/7638579652.pdfIn PDF document text
    • https://cdn.sqhk.co/senepaderu/hdIhd3W/voice_recorder_app_download_free_for_laptop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://koxosam.rf.gd/boden_usa_size_guide.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_off0000dbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFC 5524 bytes
SHA-256: fade9d7aaac723603fe0e77e57dfc2e410d8014d41bc1738d14cea38ff4150b8
font_01_sfnt_off0000eecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 9768 bytes
SHA-256: 94d4f7e402788685841a1d0429438444e73279adc030d430b7f1ffd59653ab5d

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