Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c4f920bca339d4…

MALICIOUS

PDF

77.8 KB Created: 2021-03-06 02:32:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3518c71ec7c9130ac71bce24393ac14b SHA-1: 53681230e3bea04400b2fb54b9e0a0df8c79a642 SHA-256: 92c4f920bca339d490b8935ddf87819afe0fb1a958868be87f463bce8077e225
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as part of a link farm designed to generate SEO traffic. The primary external URL points to a domain associated with malicious activity. While no scripts were extracted, the PDF structure and the presence of many external links strongly suggest a malicious intent to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/award?keyword=how+to+sight+in+a+rifle+at+25+yards
    • https://cdn.sqhk.co/gudopokobipa/jhuhbdJ/sizake.pdf
    • http://giwosoto.sportsontheweb.net/zexowafumurezizimanise.pdf
    • https://cdn.sqhk.co/tinipuded/hjgijdI/divuzilov.pdf
    • https://cdn.sqhk.co/negolura/FgfzVjf/free_events_in_atlanta_tomorrow.pdf
    • http://waxedeb.getenjoyment.net/is_the_ball_allowed_to_bounce_twice_in_ping_pong.pdf
    • https://cdn.sqhk.co/vituxezij/hiMgaJC/dual_monitor_setup_one_hdmi_port.pdf
    • https://cdn.sqhk.co/tawibonikigo/i6jdGjc/pajenosapomoxanulubugox.pdf
    • https://tofeniva.weebly.com/uploads/1/3/4/6/134625175/56900dbe006.pdf
    • https://mijonogopo.weebly.com/uploads/1/3/5/3/135327524/7036500.pdf
    • https://cdn.sqhk.co/tejilunuf/RPFhen1/picker_3d_apk.pdf
    • https://cdn.sqhk.co/reromiwo/jaibzih/how_to_use_vocal_pitch_monitor_app.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/29d5bae3-ca99-4ce5-84c2-19f0a0507088/how_to_service_an_insinkerator.pdf
    • https://uploads.strikinglycdn.com/files/c93365a7-4857-474d-9537-a5402b1d16a5/python_3_and_tkinter_programming.pdf
    • http://keregimuw.onlinewebshop.net/a_confederacy_of_dunces_ignatius_character.pdf
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_47799415c74340e39c4e69a2b1202bc8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/07ac2725-413d-4ca0-8c22-e34d3baffff6/selections_from_the_complete_works_of_swami_vivekananda.pdf
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_cddb40e27def45068fb4b67279d57918.pdf?index=true
    • https://uploads.strikinglycdn.com/files/08b420e0-174a-460e-92a0-13a3f768a107/fegenibavodiwo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3d6.bin
5d45095f03e9a6dd2af7e9880bd60d6bfc001429b8775623419ff727745dad66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D6 5580 bytes
font_01_sfnt_off000106e8.bin
d124b97fe965a5de4d26106aee36facdb546b5eafd53d160c5fda6f776edbec6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106E8 10184 bytes

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