Malicious PDF — malware analysis report

Static analysis result for SHA-256 b342a53edcc2f4ca…

MALICIOUS

PDF

72.8 KB Created: 2021-02-10 03:05:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: dd1567c7283d7e0f48c55efd6451fad6 SHA-1: 0784737e3a0bdbdf90ceed5e567076d2e85fc46a SHA-256: b342a53edcc2f4ca4588bf4987908b8f94b5486761e254250637e921481b133a
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It employs social engineering tactics, specifically a browser extension installation lure and a command-line execution lure, to trick the user into performing dangerous actions. The document also contains numerous embedded URLs, with one pointing to a potential command and control server.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jottigo.ru/wb?keyword=autoexec%20nt%20windows%20xp PDF link annotation
    • https://vejotawugupexo.weebly.com/uploads/1/3/4/7/134756202/e3fb6fbc7369.pdfIn PDF document text
    • https://povemiloten.weebly.com/uploads/1/3/4/6/134608376/zugabuwurupara.pdfIn PDF document text
    • http://wiwafapudipib.iblogger.org/calcitonina_e_paratormnio.pdfIn PDF document text
    • https://tijirurilulade.weebly.com/uploads/1/3/4/3/134312421/969ba1b.pdfIn PDF document text
    • https://jirozonuk.weebly.com/uploads/1/3/1/6/131606844/31ec17d5a8a08.pdfIn PDF document text
    • http://kekisire.22web.org/bojiwe.pdfIn PDF document text
    • https://wilukogata.weebly.com/uploads/1/3/5/3/135388132/kigazibiboretap.pdfIn PDF document text
    • http://loxebosobudi.66ghz.com/baskerville_bold_normal_western_font_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mupegutiwigo.epizy.com/33775041923.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/80548788171.pdfIn PDF document text
    • http://buvazow.epizy.com/fiba_basketball_scoresheet_free.pdfIn PDF document text
    • http://nudizelaf.rf.gd/rulotofuvegisupadibo.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/bebo_honey_singh_song_free.pdfIn PDF document text
    • http://nowozogep.epizy.com/21010732856.pdfIn PDF document text
    • http://livukuxuperum.epizy.com/7th_standard_tamil_guide_2nd_term.pdfIn PDF document text
    • http://joriboka.epizy.com/believe_in_yourself_joseph_murphy_free.pdfIn PDF document text
    • http://damedosa.rf.gd/combining_radical_expressions_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/toparopigigironizu.pdfIn PDF document text
    • http://xesovukefezusag.rf.gd/anti_corruption_act_namibia.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_off0000dd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5D 4880 bytes
SHA-256: 85033b9d75e50b8267320550d9dade2e48a889fdccedf1ea834357e2a038441b
font_01_sfnt_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 11728 bytes
SHA-256: 27786d795f5ffc00995bfe8a4c24b1900b379921884a52e94093043ebcd9109b

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