Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec85c3ce9f89307c…

MALICIOUS

PDF

77.8 KB Created: 2021-03-14 17:46:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f031193133ecf64d53bb75def7cca1a5 SHA-1: 3622e107228ab7b72f8452f6eebcc4a800531987 SHA-256: ec85c3ce9f89307c9567af62c44579f95671d8b62cbff8612d0712021bd0d085
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'dafemum.ru'. The ML classifier also strongly flagged this PDF as malicious. Although no scripts were extracted, the embedded URL is the primary indicator of malicious intent, likely leading to a phishing or malware download 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://dafemum.ru/wix?keyword=pathfinder+core+races In PDF document text
    • http://damalakin.22web.org/loliko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pukaridimupo/95117513016.pdfIn PDF document text
    • http://resisimokopi.epizy.com/genetic_algorithms_with_python_book.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/franchise_tax_report_arkansas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98a27b26-fd69-40fc-bc7d-757521417085/sonuvetugafajatenat.pdfIn PDF document text
    • http://bopadem.rf.gd/967409410.pdfIn PDF document text
    • http://sidajewaset.epizy.com/80713824690.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35cf7114-f3ff-49ee-ad21-e86ebb587a54/how_to_fix_samsung_led_tv_vertical_lines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98bfa236-130b-40cf-91f2-347e291b7c3d/how_to_fix_web_services_on_hp_printer.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/self_calculating_timesheet_excel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/how_to_construct_income_statement_forecasting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a75f16c1-1d4e-468d-8ba4-9b3bf5003955/zunevomoze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f2a0603-f002-4c03-ae8e-b6090013b181/bugusumusikekabebabiw.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/49705627179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52462fc3-d722-437a-849c-e397f5ffc08f/mofatif.pdfIn PDF document text
    • http://jutatodimat.epizy.com/26627050020.pdfIn PDF document text
    • http://fudowoxalukiki.rf.gd/xikuxeki.pdfIn PDF document text
    • http://gomusogo.rf.gd/history_alive_the_ancient_world_online_textbook.pdfIn PDF document text
    • http://rosodojilu.rf.gd/78484732621.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE928 4864 bytes
SHA-256: 6dbf8e36af60483a8f21c1236730674f0f01b5e7a55a1d87006d48513e8ec996
font_01_sfnt_off0000f99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99A 10116 bytes
SHA-256: 7c82cca846aa34af82b918041ecc7d3bde492630af5f3cb7254702c891bcf561
font_02_sfnt_off00011c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C38 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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