Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd98960632f339a4…

MALICIOUS

PDF

74.9 KB Created: 2021-02-28 21:06:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: deb8bbc93ba5ca0e25de327d80440c88 SHA-1: 19cc2ecf3f88505bfbd3b597eb7e0d6906d98651 SHA-256: cd98960632f339a4505fc2b9b40b4582471c79bb26869874bf93af0135b0eb51
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the link farm point towards an effort to redirect users to malicious 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://gimoguvi.ru/123?utm_term=are+onn+bluetooth+headphones+waterproof PDF link annotation
    • http://pearhaidhr.fun/57643647731k6k48.pdfIn PDF document text
    • http://wimuzawoxi.getenjoyment.net/dsc_pc1616_user_manual.pdfIn PDF document text
    • http://kulinar2020.site/beck_youth_inventorytn6cu.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/56832846490.pdfIn PDF document text
    • http://bisibometixo.mywebcommunity.org/70404981237.pdfIn PDF document text
    • http://teksalon.xyz/mibarerasalononixuvubowiibeuq.pdfIn PDF document text
    • http://hookup153.fun/korean_language_basic_words_with_english_translation6n4by.pdfIn PDF document text
    • http://car-den.ru/youre_ugly_too_lorrie_moorercdsj.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/places_to_donate_furniture_in_nyc.pdfIn PDF document text
    • http://vuwimoxit.mygamesonline.org/rinivuraxurixijovafa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tososite.onlinewebshop.net/best_crossfit_wod_ever.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/how_to_use_a_nikon_coolpix_p520.pdfIn PDF document text
    • http://gupizamowakop.myartsonline.com/borozepajudo.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_off0000e8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 5352 bytes
SHA-256: 9f4e7f8e2b5d03ba1cfddd13225cfca28df6b8bec094c1ff9024fabd82298113
font_01_sfnt_off0000fafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFB 10508 bytes
SHA-256: f022a156d674a21633ad4c50633a1c6dfe7847eb209b5acdc012eb7a5bfaaed5

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