Malicious PDF — malware analysis report

Static analysis result for SHA-256 53022f051ecd36f7…

MALICIOUS

PDF

80.9 KB Created: 2021-01-23 02:17:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5352bdfb1fa9671b9441d8508e3ecaa6 SHA-1: 71d50b324e2d0b2c4df80311c0565e5787643130 SHA-256: 53022f051ecd36f773a27e623a37a5c7973facc09790cab82a50b280c44c0ee9
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded links, particularly the one to 'traffmen.ru', indicate a redirection attempt to potentially malicious content. The document's structure and numerous links suggest it's designed to lure users into clicking through to external sites.

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
  • 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 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.
  • 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=california+light+works+solar+extreme+500 In PDF document text
    • https://site-1168211.mozfiles.com/files/1168211/android_app_tutorialspoint.pdfIn PDF document text
    • https://site-1195473.mozfiles.com/files/1195473/mexudatatolu.pdfIn PDF document text
    • http://kefojixesopu.66ghz.com/contagem_de_coliformes_totais_e_fecais.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/ftzQpZV/puxubotexamurimadu.pdfIn PDF document text
    • http://fevuworejefe.iblogger.org/adb_driver_xiaomi_manual.pdfIn PDF document text
    • https://site-1172895.mozfiles.com/files/1172895/puxenolidagawax.pdfIn PDF document text
    • https://site-1175125.mozfiles.com/files/1175125/music_video_maker_slideshow_uptodown.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://govujetimavex.epizy.com/grid_template_for_instagram.pdfIn PDF document text
    • http://lumigetutiburu.epizy.com/profit_loss_account_format.pdfIn PDF document text
    • http://mesuwirafifi.rf.gd/narasimha_swamy_naa_songs_telugu.pdfIn PDF document text
    • http://susugafof.epizy.com/format_essay_spm_report.pdfIn PDF document text
    • http://fipuxogililego.epizy.com/exercises_for_carpal_tunnel_syndrome.pdfIn PDF document text
    • http://demezokesude.rf.gd/fubugizavunubonuro.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 5480 bytes
SHA-256: 0550196d88c2c60826d6b75d8dc47a271ddb02d3321a5dcbe3a391141e2fe655
font_01_sfnt_off0000ffe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE4 11948 bytes
SHA-256: c580ecbd925d0c4e84595e2351ed0c46991e5d76e88ed69c20ef8d60c815acb4
font_02_sfnt_off0001287d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287D 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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