Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c56a16fbd524a8…

MALICIOUS

PDF

80.7 KB Created: 2021-03-21 23:01:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 957d4985da4909a53a990ae884104aea SHA-1: 1e4aa9ab30c264733b067fa10d47b15ab20644ea SHA-256: 72c56a16fbd524a807c0b1957fddce26fed11e3ba12f2527143ef824c7f4e042
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, characteristic of a link farm designed for SEO manipulation or to distribute further malware. The embedded URLs suggest the document's primary purpose is to redirect users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/wix?keyword=cross+disciplinary+vs+interdisciplinary PDF link annotation
    • http://hidver.com/resumen_del_libro_para_leer_al_pato_donaldfx95r.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/hbIgiie/juventus_vs_sampdoria.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/hjgjaYS/8016821785.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxamomajil/Zhejagc/kingdom_builders_toys.pdfIn PDF document text
    • https://cdn.sqhk.co/najiligopej/mjcibif/puppy_backgrounds_for_your_computer.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/gdhcJgg/flexural_strength_test_report.pdfIn PDF document text
    • https://cdn.sqhk.co/jagojixego/K3idSjc/fofegerulururad.pdfIn PDF document text
    • https://cdn.sqhk.co/bitanalagep/cjjeZib/ibis_paint_pro_free_download_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/fudamozomeb/ghcP4Xn/ultimate_bike_driving_simulator_mod_apk_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/butituguxur/5gj805Z/babylist_box_september_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/FigidEb/92299012432.pdfIn PDF document text
    • http://claire-irk.ru/21093838075o1jjq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_06deaab2b2284041a20d1ce59a97dc69.pdf?index=trueIn PDF document text
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_a406b91e639c47b7b2fd0d36fa0c0300.pdf?index=trueIn PDF document text
    • http://sokagozu.rf.gd/13980548009.pdfIn PDF document text
    • http://kolofagigetu.epizy.com/gol_linhas_aereas_inteligentes_sa_annual_report.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_5abdf6563d6a44ca96d8de886fa239a2.pdf?index=trueIn PDF document text
    • https://a2ceb3c2-83c1-4271-bf13-c51b23e634aa.filesusr.com/ugd/e3c460_a6a2e89ab688409996937e9e959cd849.pdf?index=trueIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_5c37ddf2cf5a45a8ad4bac0c0a6d4f3f.pdf?index=trueIn PDF document text
    • http://sipomivizipe.epizy.com/importance_of_science_laboratory.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_off0000f734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF734 5136 bytes
SHA-256: 6b9df179ccef4ad46abd731f98f0257ad2e66eae00b40e7b19998a640f6c4da6
font_01_sfnt_off000108c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C0 13768 bytes
SHA-256: 4085c3b66f1ee8a11ad48e15966400fb9a108dfed42e3b0941863de18cbe7d61