Malicious PDF — malware analysis report

Static analysis result for SHA-256 105399f7308cf5fe…

MALICIOUS

PDF

73.7 KB Created: 2021-02-01 20:51:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 78823ab83b57765357f766ce2bb0ffd1 SHA-1: 129ab52192a17c23e536598ae816104a7c105a75 SHA-256: 105399f7308cf5feb1db93051c12329233fefd9b3b0fcab3dee9cd3a851ca178
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the PDF structure itself is designed to redirect users to potentially harmful external sites.

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://maypoin.ru/123?utm_term=billy+idol+cyberpunk+songs PDF link annotation
    • https://pesasujax.weebly.com/uploads/1/3/4/8/134882000/8105346.pdfIn PDF document text
    • http://prostotit.site/glitch_cam_pro_apk_video_editor1shg2.pdfIn PDF document text
    • http://formblckr1.xyz/ich_guidelines_for_cleaning_method_validationo830g.pdfIn PDF document text
    • http://xesesevatep.22web.org/acknowledgement_of_offer_letter_template.pdfIn PDF document text
    • https://wozukepob.weebly.com/uploads/1/3/4/0/134017809/110912c60.pdfIn PDF document text
    • https://dawemewi.weebly.com/uploads/1/3/4/7/134747996/6634717.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.site/free_video_editor_for_youtube_channellaz40.pdfIn PDF document text
    • https://xufodikufidu.weebly.com/uploads/1/3/5/3/135382923/kuloleratisuziduwu.pdfIn PDF document text
    • https://xukizawumu.weebly.com/uploads/1/3/1/3/131380236/8577567.pdfIn PDF document text
    • http://nefritthebestthing.site/81975993352tskoi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fagugawuw.epizy.com/app_banorte_movil_para_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/soderek.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/koxodabekaso.pdfIn PDF document text
    • http://vutaxinasiva.epizy.com/aptana_studio_mac.pdfIn PDF document text
    • http://pixoriwabivonol.rf.gd/91817267542.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/39569648350.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_off0000df9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9A 5388 bytes
SHA-256: ea272935206862fce5c266ae07070cc20683052678d263c3bd6c128cc866260c
font_01_sfnt_off0000f206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF206 11592 bytes
SHA-256: f805fb8da8959669a6ac74a1e75e17b6445919fc07fabc2506f906356bdf0a3c

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