Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd022edd5ebdb18…

MALICIOUS

PDF

68.2 KB Created: 2021-01-15 13:13:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 24e5196f2989c9ffdae82db59f875aa0 SHA-1: 2eb2572f306384bf979cf7486e78ea291a7338b0 SHA-256: 3fd022edd5ebdb18381e6d0dc25c004022b0d1dee93de0497538665017efffb0
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, including a known malicious redirector. Heuristics indicate the PDF is designed to link to a large number of external PDFs, likely as part of a link farm or SEO manipulation to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://traffmen.ru/123?utm_term=harrington+on+modern+tournament+poker+pdf In PDF document text
    • https://cdn.sqhk.co/vujenibolo/BOghf6q/serato_dj_sound_effects_download.pdfIn PDF document text
    • https://wudizabilizone.weebly.com/uploads/1/3/4/7/134745746/49841de946.pdfIn PDF document text
    • https://site-1174360.mozfiles.com/files/1174360/pbs_unnatural_causes_in_sickness_and_in_wealth.pdfIn PDF document text
    • https://cdn.sqhk.co/tejikeluz/6kUMR5e/learn_to_speak_english_online_games.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/OgiQhj4/shiftgig_contact_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/gukawaki/FUAfijJ/jerugibugafobinukajumosuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/1124217548.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/sarabande_in_d_minor_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/13090511450.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_off0000d197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD197 5176 bytes
SHA-256: 7eb42c8aed37b1ee9ddd20be8b92bc3e7ba5ee6e6ae78eddb8ff6f10aafe4a2f
font_01_sfnt_off0000e321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE321 9704 bytes
SHA-256: 2eeea2ef93b10610d3593bcb96e7274a571bd6a24ce7903e312af6ddca2f23e7

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