Malicious PDF — malware analysis report

Static analysis result for SHA-256 25db98a6336d388e…

MALICIOUS

PDF

76.9 KB Created: 2021-02-28 23:59:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a97d060a8888bc9aff66fa081452640c SHA-1: 24ebbfc2f6f36d7bfa79c700d9623917b5cb03d5 SHA-256: 25db98a6336d388ea31adb04336ddfb7ea88fa7ac533b94ea1f5ce9699f4f551
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely intended to trick users into visiting malicious websites.

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://resalured.ru/strik?utm_term=straight+through+utp+cable+color+coding PDF link annotation
    • http://igafnd.org/how_to_glaze_a_spiral_cut_ham9kwfy.pdfIn PDF document text
    • http://my-favshop.online/60869381349jg8mp.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/1010854749505ak7.pdfIn PDF document text
    • http://coins24h.com/tokogetejao8koj.pdfIn PDF document text
    • http://stankovit.ru/204632182188uayi.pdfIn PDF document text
    • http://best-store.club/how_fast_is_a_yamaha_fz6o471y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445573/normal_60123ab46af83.pdfIn PDF document text
    • http://vclean-sale.shop/my_passport_ultra_installation_windows_108f8gf.pdfIn PDF document text
    • https://cdn.sqhk.co/fosojatesog/gijep5O/shaver_prank_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417205/normal_5fdb0a5e9592b.pdfIn PDF document text
    • https://cdn.sqhk.co/furugilenu/HheWgih/dehradun_defence_academy_fees.pdfIn PDF document text
    • http://teenagetutor.online/1469143714e9ppz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423171/normal_601797178af08.pdfIn PDF document text
    • https://cdn.sqhk.co/ravusigi/lihicTZ/78066728378.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377647/normal_60068f95ae886.pdfIn PDF document text
    • http://cybety.xyz/raludivadpary.pdfIn PDF document text
    • http://bilkan.fun/vox_tonelab_st_vs_les5l4l.pdfIn PDF document text
    • http://italywom.space/libatatubodanewenadako64ts3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 5400 bytes
SHA-256: f7e68cd74c74c4de0ea007e2341822dc367a4db1f1d0308a5427c4afe5c531c7
font_01_sfnt_off000102a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A1 10592 bytes
SHA-256: cfb569b1908b7660fc1c7fc750c8ca308d07edc85f5556feac1083747db85922

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