Malicious PDF — malware analysis report

Static analysis result for SHA-256 26bd430e56af815e…

MALICIOUS

PDF

83.0 KB Created: 2021-03-14 04:01:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: dc20fa5f17dd52191b06b5f5ac53c8c7 SHA-1: 7f98555a982683b3a694fc0078ae88c9f7a8c430 SHA-256: 26bd430e56af815e34fc3360d0fb41bfbcb28281bf7cfc729e7f805b9f5ff17e
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, indicating a phishing or malware distribution attempt. It contains a large number of embedded links, many pointing to disposable hosting, and one specifically to a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to a manual, likely to trick users into clicking the malicious links.

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://crophysi.ru/wix?keyword=kerbal+space+program+manual+espa%25C3%25B1ol+pdf In PDF document text
    • https://cdn.sqhk.co/wavagowew/hahb8gg/9757371324.pdfIn PDF document text
    • https://cdn.sqhk.co/niripakexad/e8jfjjj/bexar_county_detention_officer_uniform.pdfIn PDF document text
    • http://sizegivip.22web.org/grievance_hearing_form.pdfIn PDF document text
    • https://cdn.sqhk.co/samivegin/Zgfdfgh/9002614481.pdfIn PDF document text
    • https://cdn.sqhk.co/vufuvevu/gcfNgi7/kukanaxagixinij.pdfIn PDF document text
    • https://cdn.sqhk.co/nivipanevi/5jj62jd/89105881440.pdfIn PDF document text
    • http://pabazumakubonok.66ghz.com/pepatimorenujiwinut.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://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_55b021fdc9ea4157b877dddfb138fb41.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9916d02-6a02-4876-afe2-b7151dba473b/how_to_understand_math_equations.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/136055342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccfad3aa-02fe-4188-9d86-59cd13d21619/wodevotogaxujebididumi.pdfIn PDF document text
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_3d2468f914e344279161493adef987b6.pdf?index=trueIn PDF document text
    • http://duwamiwimi.rf.gd/chest_heparin_induced_thrombocytopenia_guidelines.pdfIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_8ffeb68ac4d9400895cda52ab2b5dad2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d4d4861-6a53-463b-970b-6760dd5eb662/lowrance_hook_5_hdi_price.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/how_to_do_npv_sensitivity_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e03e7941-da03-4901-9302-8a8482ea6a84/dipabujejef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11f2eb38-23b7-4c6a-a625-b06c52c1d1d0/63101203744.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/xuwilopubeja.pdfIn PDF document text
    • http://fojoxolizono.rf.gd/iphone_calendar_answer_cannot_be_sent.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_off0000f6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DD 5548 bytes
SHA-256: 1baac1c4bddcfc2898744b5c947180e5dc960d1c067b40884e0b662ebb809ad9
font_01_sfnt_off00010953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10953 11344 bytes
SHA-256: a6a15e372b7b4c7d4df927432963bc838bbf027e91b1463a716d363ae4b7bb00
font_02_sfnt_off00012e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E88 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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