Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4caaaa4dd96fb5…

MALICIOUS

PDF

83.7 KB Created: 2021-01-21 12:42:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 47e2e1123cae1da214e4606aede0ceab SHA-1: 891367d71e7a4f78441d1147cc7c6afcaef9e1cc SHA-256: 5d4caaaa4dd96fb533b894ab0edaa9d4dcbd8d3d327a0ce2466d66e43a04cfc2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to direct users to potentially harmful websites. The ClamAV detection and ML classifier further support its malicious nature, flagging it as a phishing or trojan PDF. While no scripts were explicitly extracted, the presence of numerous external URIs indicates an attempt to redirect users, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://traffking.ru/aws?utm_term=bapcoc+2017+pdf PDF link annotation
    • https://site-1168409.mozfiles.com/files/1168409/93318128000.pdfIn PDF document text
    • https://site-1225090.mozfiles.com/files/1225090/tanakovisafujoxuv.pdfIn PDF document text
    • https://bobidowi.weebly.com/uploads/1/3/2/7/132740787/2264883.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/gfjb19N/mirutefuki.pdfIn PDF document text
    • https://site-1166601.mozfiles.com/files/1166601/whispering_angel_rose_wine_costco.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/ZCiggj8/dirty_panda_bubble_tea_menu.pdfIn PDF document text
    • https://site-1176776.mozfiles.com/files/1176776/ecobee_installation_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/webuzifinuno/Wbigih6/samijexaxexifi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://felubumasosazi.epizy.com/51488875411.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/3591561918.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/94901066891.pdfIn PDF document text
    • http://lepomosafajuki.rf.gd/2015_chrysler_200_s_performance_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/application_for_study_leave_sample_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/16487960637.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/zapavuvuvigezosud.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_off0000e682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE682 5296 bytes
SHA-256: 6a58ac0758d2eef717dabcf1783ccb9dfbecfddf5f13846580563664155f3afb
font_01_sfnt_off0000f8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B1 11028 bytes
SHA-256: 9951fde477bae5096e9ccf7f02f830c9ce84a0a9410a3f5e2458923578c80e12
font_02_sfnt_off00011e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E54 21400 bytes
SHA-256: 3f90b8e6a46758690f599ab97993dc3d1626bd71b03f012051639097741c17b7

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