Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a2ef3b2027fb29…

MALICIOUS

PDF

76.7 KB Created: 2020-12-03 08:54:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 28feee6bebd36244c4fbb86181384d4b SHA-1: 74048312311d7155319c716332a7f8a4f1fea052 SHA-256: 77a2ef3b2027fb29201661bdc284a896cb0c0b0a173edd766e619f252af0c15b
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://ggtraff.ru/123?utm_term=general+grabber+atx+tires In PDF document text
    • https://cdn-cms.f-static.net/uploads/4498345/normal_5fb5373fcacca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453134/normal_5fadc64d7132f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443814/normal_5fa287f9c3862.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/e198e0be-50f6-4a55-ba31-0b69fec09480/88817777437.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe169afa04221c71e8adcb/1606293147054/unblocked_games_65.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2c059f9-8ffd-4602-863b-d13053df7068/jurol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63604155-5062-4ed7-8809-a70376773bf3/65804964966.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe1c7ccb3e0f57711737d4/1606294655494/how_to_make_it_day_in_minecraft_cheat.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/guilds_of_ravnica_early_pick_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1722a604-2baf-4e75-a2ca-1a8686bed0d7/22851593121.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/reduced_formic_acid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fefc7a4-4b4e-48b4-b034-9baca9291a19/foo_fighters_mp3.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_off0000ef34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF34 5092 bytes
SHA-256: 43f8898e319422f65778b9f4b0567e66b2550be6b05d42e7030da7131a443804
font_01_sfnt_off00010094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10094 10988 bytes
SHA-256: 6204c6e7429d309e1a09e441f623546e50831c8e0656afc1d131539c12da4b59

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