Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c41a5863adc3b3…

MALICIOUS

PDF

75.4 KB Created: 2021-03-07 07:32:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 040a26b8d2ef03de383d7a14a46e4ae9 SHA-1: e94792f52e704b60f9edaac8df5b383fa3f3b325 SHA-256: a9c41a5863adc3b36938d4601a42bfffe08ec9c0e7bd960e9736a6ed95d9f49f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a common phishing lure, likely designed to redirect users to a malicious site.

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://soxebez.ru/aws?utm_term=que+es+autorretenedores+de+iva PDF link annotation
    • https://cdn.sqhk.co/xeduwukaxusa/jfAukJr/flex_fuel_injector_flow_rate.pdfIn PDF document text
    • http://sepoxudozixo.sportsontheweb.net/vovalikam.pdfIn PDF document text
    • http://ponaxamewimenul.sportsontheweb.net/85365658157.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/2ptfqig/card_crawl_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/nazalugewu/4Mhahbm/shipping_label_template_avery_5164.pdfIn PDF document text
    • http://terugate.mypressonline.com/vojevonuloledozunulomazu.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/hem1ggb/cinema_box_office_uk.pdfIn PDF document text
    • http://nakalabaxis.mywebcommunity.org/nalaleweviwo.pdfIn PDF document text
    • http://vowufijetapiko.sportsontheweb.net/how_to_use_the_benedictine_breviary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1196d8c2-3b8a-4e56-87a9-f91e18c68e99/52145145569.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/1440415249.pdfIn PDF document text
    • http://gifidabula.atwebpages.com/begikufafebubodotug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b448d532-9026-4e1e-9000-bdbeb39753d4/snugride_snuglock_30_base.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/how_do_i_log_into_my_facebook_portal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/562d1089-659c-4fa9-aa05-e816b495b08f/descargar_gratis_el_cigarrillo_ana_gabriel.pdfIn PDF document text
    • http://zitasixan.atwebpages.com/what_are_the_software_development_life_cycle_models.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/kobofadib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0a7d233-22c0-42e4-a1d2-74fa8f7bdb0a/como_hacer_una_linea_del_tiempo_en_word_larga.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_off0000e6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D9 4908 bytes
SHA-256: 6a03edfe52fd9b43abf6f7a429af96d5bb2fdedbc3bf6e977c4a0dda4b95af83
font_01_sfnt_off0000f79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 12048 bytes
SHA-256: fd347f470fe8fe78fddba2690c286adcd13dab430f1e066dd016d1f0a190973f

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