Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e203f6ddd424f8…

MALICIOUS

PDF

74.9 KB Created: 2021-02-09 10:58:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 568bb43e782a52e3cc0742db2adf384f SHA-1: a6eb5af644b7298e7e82e63246e8701220d8ded9 SHA-256: 55e203f6ddd424f80de7df62768918df15d011a68a4a671c35ca563a842853c9
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 trojan. It contains numerous embedded URLs, with one prominent URL pointing to a link farm on disposable hosting, suggesting a phishing or scam attempt. Although no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wb?keyword=amortissement%20lin%C3%A9aire%20exercice%20pdf PDF link annotation
    • https://vurerabekude.weebly.com/uploads/1/3/4/4/134493837/zusibowegutope.pdfIn PDF document text
    • https://mumizovis.weebly.com/uploads/1/3/4/3/134350635/zesosenarivasidarezu.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/assassination_of_rajiv_gandhi_subramanian_swamy_free_download8ldih.pdfIn PDF document text
    • http://bristol-yalta.run/walking_dead_zombie_maske10pab.pdfIn PDF document text
    • https://jizetexosobuwek.weebly.com/uploads/1/3/0/7/130740437/8536606.pdfIn PDF document text
    • https://zinuwikisabarek.weebly.com/uploads/1/3/4/6/134679236/8be271a75eb.pdfIn PDF document text
    • https://pufukowog.weebly.com/uploads/1/3/4/5/134583281/lujuvawojixapiwotab.pdfIn PDF document text
    • http://duvazejezirofid.22web.org/lottery_awards_for_all_application_form.pdfIn PDF document text
    • http://love-your-lips.online/press_your_luck_cheater_documentaryy1ciz.pdfIn PDF document text
    • http://kipivejezijab.iblogger.org/34286573603.pdfIn PDF document text
    • https://lewagezu.weebly.com/uploads/1/3/4/3/134369469/puteretabexarep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pejonoma.epizy.com/java_runtime_environment_7._0_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/autolesiones_en_nios.pdfIn PDF document text
    • http://xofawuriduk.epizy.com/types_of_ceramic_materials.pdfIn PDF document text
    • http://xewabilema.epizy.com/twin_bed_platform_frame_plans.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/who_viewed_my_instagram_profile_app.pdfIn PDF document text
    • http://jeruzofifisamen.rf.gd/pojodosaz.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/boramovepigonodog.pdfIn PDF document text
    • http://puwukuju.epizy.com/amelia_bedelia_talks_turkey_guided_reading_level.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_off0000e3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E2 5500 bytes
SHA-256: 8909bb3a12988a9a8624dbb8a2480ff026d7a4ed8fafa6ccd81691e82db1739b
font_01_sfnt_off0000f63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63E 11864 bytes
SHA-256: 6267935001dfbc81dde300151ff423f162c8d0def70e44bd027179212273f642

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