Malicious PDF — malware analysis report

Static analysis result for SHA-256 039cb2e910626d3f…

MALICIOUS

PDF

66.8 KB Created: 2021-02-22 14:00:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: aa9d30843abba10904111c66832cd967 SHA-1: e64d17f1e377ef193abc10cd1bae342d42a672b5 SHA-256: 039cb2e910626d3f5e28d267e649a73288829a0ecf34fc50dadc1a4c6f94de7a
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to potentially malicious domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it's designed to lead users to compromised or malicious websites.

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 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://seumenha.ru/aws?utm_term=taylormade+r15+hybrid+3 PDF link annotation
    • http://wofeboz.66ghz.com/gasitafi.pdfIn PDF document text
    • http://xujavimok.22web.org/replace_waste_toner_box_brother_hl-3170cdw.pdfIn PDF document text
    • https://pesosadat.weebly.com/uploads/1/3/4/8/134885101/932fc.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/gA894o3/march_2021_calendar_printable_free.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/gezizefefififa/canon_7d_manual_setting_for_outdoor_photo.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/mystatlab_pearson_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/wafixalifodufakurito.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/platform_high_heels_size_12.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/chrome_web_store_apps_free.pdfIn PDF document text
    • http://redikubegoda.epizy.com/bunker_calculation_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/84338359102.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/telugu_love_feeling_video_songs_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/nms_case_files_surgery.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/31830623338.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/worksheets_of_fractions_for_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/13811087583.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_off0000c5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B4 5416 bytes
SHA-256: 57c449fb9f3d4126ac75605c3f5045fda608f37eed2aabc29d52ec7390592d50
font_01_sfnt_off0000d807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD807 10632 bytes
SHA-256: ffdeba391317ca67726519423dad826ca7c4196ad796f556b5f8d705f415360c

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