Malicious PDF — malware analysis report

Static analysis result for SHA-256 5362756fa867f66a…

MALICIOUS

PDF

79.0 KB Created: 2020-12-20 08:54:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5a9b2b4a8afeef5ad72f076a77677e76 SHA-1: 776b26e6801157e6ec75e49fa727349b50c72138 SHA-256: 5362756fa867f66ac80ec1f043594ed857920c8c45fdc4e21de34e1630d2aabb
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors or link farms. The presence of the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics, along with the ClamAV detection, strongly indicates a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains fragments that suggest a medical context, potentially used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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.
  • 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=ecg+shows+right+atrial+enlargement In PDF document text
    • https://xaluwidadi.weebly.com/uploads/1/3/4/8/134860769/rowupuboderuwo.pdfIn PDF document text
    • https://vekerarefatada.weebly.com/uploads/1/3/4/8/134868636/bisariwevuwa.pdfIn PDF document text
    • https://mimoberojatef.weebly.com/uploads/1/3/4/3/134316463/jawexibavesixipewu.pdfIn PDF document text
    • https://jojavofeze.weebly.com/uploads/1/3/4/3/134395471/2930062.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/3cd7286f-2d96-4b17-b46c-a1fdfe193179/5693040389.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc06b0d2e537a05ef0695ba/t/5fc17a06f8cdb769c61b65ea/1606515207964/proverbs_1_kjv_listen.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc002d40b6b03258f30bf3d/t/5fd06f585c296e7a6874fdaa/1607495512945/59703088978.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc57099a3bf4b14abc7ab13/t/5fc6df1ce2dcb1274dde30df/1606868764842/7129573221.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a789e3de-64c4-4f49-81bf-5dd07b178335/67530982532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32e9ab2a-b5b2-4226-8bd1-143e085b7997/most_expensive_ring_in_the_world_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e10e84b-cf77-45bb-ba9c-c180d6cc8a54/99400740691.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0cb8bac-af61-458d-842f-a18fe5b8f9a7/vurojubakepokew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/342f7b5a-c42b-4d62-8338-e3f1050dbef9/ribafobamedax.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2a60b1c8c7413143d24fc/t/5fc7d0773e96977c29c65d95/1606930551056/fun_games_to_play_with_friends_online.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5ebb3c02f22b9d04e48e/1606377148313/nukasuj.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22E 5260 bytes
SHA-256: 4021a1a6b35e0a001367fd6a37bca27d4a278d06a115e8dab21065dfe27ebf2d
font_01_sfnt_off0000f404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF404 11032 bytes
SHA-256: c8eb03adb8a06b4cd4c6cd53079589bd1678b90024cb527f42f6e1dc7e8995b7
font_02_sfnt_off000119cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CD 16092 bytes
SHA-256: 3aad8f736d68201c4a8387338ab5b73e899d8d5dbdf6ead162eb48e90402f37f

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