Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b603a881746c33…

MALICIOUS

PDF

89.3 KB Created: 2021-02-26 15:43:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e83fa045b5bd25fe2269154a19062816 SHA-1: 2458060b72cadfdd2711f5eb4c484b6f051e35ce SHA-256: d9b603a881746c334718ccf2c836747a40ded117ec928cbb6bce8796660eab81
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. It contains multiple embedded URLs, including one pointing to a link farm on disposable hosting, and another that redirects via a 'utm_term' parameter, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but the primary malicious indicators are the external URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://leonvi.ru/strik?utm_term=math+puzzles+for+third+graders PDF link annotation
    • http://freshnatur.fun/3334608390sc2wz.pdfIn PDF document text
    • http://nubilejoso.iblogger.org/gevepem.pdfIn PDF document text
    • http://vanlit.ru/vascular_surgery_books_freelcyc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384482/normal_5ffdc2f911263.pdfIn PDF document text
    • https://pukefigagarit.weebly.com/uploads/1/3/1/4/131406744/sosoramaxoji-fetupulabamunu-senonosupag-wadudirope.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405179/normal_5ffff7097a3a0.pdfIn PDF document text
    • http://subuxiwubemew.getenjoyment.net/the_tragedy_of_macbeth_william_shakespeare.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465025/normal_6006890076948.pdfIn PDF document text
    • http://bunnygummy.ru/ember_konu_anlatm5k3f7.pdfIn PDF document text
    • http://velesvoyage.ru/tweenlite_scale_transformjo409.pdfIn PDF document text
    • http://avtovishki-msk.ru/amlife_insurance_berhad_annual_reportfzavs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lazokobipas.rf.gd/vpn_master_vip_apk_terbaru.pdfIn PDF document text
    • http://fiwarirekagugen.epizy.com/you_cam_perfect_camera_free.pdfIn PDF document text
    • http://tepimajasajuk.epizy.com/tepiligunokamesuxagasa.pdfIn PDF document text
    • http://tifavamifikas.myartsonline.com/zuxuvujegajosabawelan.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_off000109d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D3 5360 bytes
SHA-256: b108253fe09c5c0a7f3b337dc108e7f3247a7d09cd403bec5cfcffe6418f7642
font_01_sfnt_off00011c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1B 11224 bytes
SHA-256: 5ab79faa9f419b843e869660c93732a533f18e5df362cf0426c8e56d6021e5be
font_02_sfnt_off000142e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E2 16164 bytes
SHA-256: ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1

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