Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e2dd3bc824a0404…

MALICIOUS

PDF

76.8 KB Created: 2021-05-05 12:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf18eea8f5abc681c45ac4410c40f307 SHA-1: 22a11089309a69762abb9f103643cf75304c1389 SHA-256: 7e2dd3bc824a040458692dcfb62ffbbbb9e49461e26c9c4f8948f27708f46b34
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though partially corrupted, includes a search query that likely serves as a lure to entice users to click on the embedded malicious links.

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 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://zajinet.ru/strik?utm_term=arduino+mega+2560+projects+with+code
    • https://cdn-cms.f-static.net/uploads/4444856/normal_600aa6c77dfdd.pdf
    • http://copyrighthelpcentral.com/hp_deskjet_3054_wireless_setup_wizard1x18p.pdf
    • http://levojefozaloro.mywebcommunity.org/akademia_pana_kleksa_test_ze_znajomoci_lektury.pdf
    • https://static.s123-cdn-static.com/uploads/4387819/normal_5ffc82c2468b8.pdf
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/5381779.pdf
    • http://lozipazom.sportsontheweb.net/extended_family_definition_sociology.pdf
    • http://jufanurozud.getenjoyment.net/utility_software.pdf
    • http://bottlechainworld.com/london_buses_information3h3xd.pdf
    • http://odemebayisitrafik.com/368237709298dx1x.pdf
    • http://sushibara.net/ludo_king_play_online_pcq1ist.pdf
    • http://kitafoged.medianewsonline.com/caderno_de_anotaes_congresso_2020_tenha_coragem.pdf
    • https://magirakikepemun.weebly.com/uploads/1/3/4/0/134000039/xogiguz-jigeko-rewosepuz-papos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/157dc937-abd4-4858-943f-13bf753ecaef/add_to_wix_page.pdf
    • http://foxojowekalorut.epizy.com/xofom.pdf
    • https://uploads.strikinglycdn.com/files/e3be97a2-8108-4746-8a2b-eabdef0fb8a6/digital_marketing_evening_courses_dublin.pdf
    • http://wigogejuj.epizy.com/zujiw.pdf
    • http://goxafebo.myartsonline.com/bepuzexilowavujivizowidu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb6d.bin
c97086ba5ccca650fd0dd80ce40b3477f7ae5e498f24ce2a945dd57ef3924cbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6D 6164 bytes
font_01_sfnt_off00010052.bin
bfac0b146902001288d3ec6565a07228d20574df9ceb8302be5ff7e2fce8cd31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10052 10472 bytes

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