Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae17f28e54213e5…

MALICIOUS

PDF

80.3 KB Created: 2021-03-31 01:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e9dd7539f956fad4916ff72e17270a86 SHA-1: 7c819b05d0d10a68bd14666cf3a9599647503689 SHA-256: 7ae17f28e54213e58435011bb05404e90b882a1121e9efb4322f27307524d083
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, many of which are part of a link farm designed to direct users to potentially harmful sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=call+of+cthulhu+7th+edition+quick+start+review In PDF document text
    • https://vabakapis.weebly.com/uploads/1/3/1/4/131453405/jefiko.pdfIn PDF document text
    • https://tawozajoruje.weebly.com/uploads/1/3/4/3/134314125/23cbc.pdfIn PDF document text
    • http://wowitaly.pro/20471303193fihcc.pdfIn PDF document text
    • https://fokinovev.weebly.com/uploads/1/3/0/7/130775288/667818.pdfIn PDF document text
    • http://verifybadgesbusiness.com/frederick_douglass_speech_what_to_the_slave_is_the_fourth_of_july_analysisv396q.pdfIn PDF document text
    • http://kobivoweder.mypressonline.com/what_does_black_ribbon_symbolize.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/d62fccad-19cd-4f16-b5cf-c19be4dc0486/4017317603.pdfIn PDF document text
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_80a3da03c32e4bb2ac997069cde21e13.pdf?index=trueIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/pixhawk_blheli_esc_calibration.pdfIn PDF document text
    • https://87098103-4d08-48bb-90a6-807b0ef734b2.filesusr.com/ugd/1f49de_5859f479753d439c8d4b764af0f5c443.pdf?index=trueIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_84c9b558d914477ea359724b44332165.pdf?index=trueIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_286e74cf829e42678da3fd1831f0ad9e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/156d97bc-1919-4014-b683-cd10a62daac8/king_lear_movie_2008_watch_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1b8b64d-4fc8-49f1-8757-f3ef2f4271b2/76970366313.pdfIn PDF document text
    • https://8aa13d94-a051-4bfa-911d-5e7c2f772018.filesusr.com/ugd/382cc4_c5d0905612c246cbb011fe75180e8a3c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6263c0f9-1d21-4583-a59e-c794558adba2/why_is_my_internal_mouse_not_working.pdfIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_22c43de0e00148d8826723feac34e064.pdf?index=trueIn PDF document text
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_14b22a3e96df4a0fa1072c4440f76b02.pdf?index=trueIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_b32f0a7238254aa4bf9683670c38d4bf.pdf?index=trueIn PDF document text
    • https://765a5d72-5774-4a4d-a421-5c90307110ba.filesusr.com/ugd/f2a868_67223808b82346b3be47d970ed599c3a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad097ea9-888c-47a0-9e3a-3abd91485809/how_to_study_for_project_management_exam.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_off0000fb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 5436 bytes
SHA-256: ebe8c665716a1a476b5d4775de9cee152cae15211226f1be86bae539932980cc
font_01_sfnt_off00010dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC8 11176 bytes
SHA-256: b9c448d25240c8790741fdec57b5e90f26ad801e61d4d71459e8ad17943791f1

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