Malicious PDF — malware analysis report

Static analysis result for SHA-256 99656051a7be2dd8…

MALICIOUS

PDF

69.6 KB Created: 2020-12-10 03:50:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: fbdca0c9d63b024a7e3e4c059038584e SHA-1: 110ce4c310d785fa36f2ac20aba83f7a988fa31f SHA-256: 99656051a7be2dd8e74f527ee9b499a175d29abe963e0735610fca2f6459da1a
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://trafffe.ru/strik?utm_term=xiphoid+process+pain PDF link annotation
    • https://tekegalesi.weebly.com/uploads/1/3/0/7/130740489/5125059.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499282/normal_5fb2f3a5dbbda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488103/normal_5fba0e78175d3.pdfIn PDF document text
    • https://pafazemewo.weebly.com/uploads/1/3/4/5/134517711/tegebomemusizobejij.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/zokokamu/xolemuwimeniganiludevupi.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/krishna_bal_leela_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2a06fe5-3dbe-4dfb-ab3c-ba740482a040/manualidades_cristianas_para_nios_de_2_a_3_aos.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/algebra_2_solving_equations.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/dragon_ball_super_game_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/old_time_gospel_music_radio_station.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40e8e468-9abc-43b6-ab37-73e8f3f1cf8a/maxifetezulemanesuv.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/sandy_s_candy_corporation_answers.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_off0000cf59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF59 5104 bytes
SHA-256: add907ea392ebde133eeb7dc699f8552411cbb6c1a915158ff5eb7321f8ebb24
font_01_sfnt_off0000e0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A9 12516 bytes
SHA-256: e9251b43b0a67d08b2e694d6a0a69a098d919158dc824178c3e5a8782a3e398a