Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49a3b7dec0f80d6…

MALICIOUS

PDF

85.4 KB Created: 2021-03-21 06:15:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7739e9cfcd0b9fac70a94d57608b2e41 SHA-1: e2539413cf1d182759551aea8ed8fe5bc995024b SHA-256: a49a3b7dec0f80d63a58a2bbfb09c205acfb6d2ea3384dc794245318f9dee2fd
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF file exhibits multiple high-risk heuristics, including instructions to bypass security software and execute commands via copy-pasting into a shell. The presence of numerous external URIs, some pointing to link farms and disposable hosting, suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/123?utm_term=windows+7+professional+activator+64+bit PDF link annotation
    • https://cdn.sqhk.co/finelega/aiKhjia/24863376518.pdfIn PDF document text
    • https://vusexojepaxeva.weebly.com/uploads/1/3/4/0/134096357/1370307.pdfIn PDF document text
    • http://xelonijabi.22web.org/47716652945.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380209/normal_5fe59acd46721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447278/normal_602e0df9f0299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_6011c2338a161.pdfIn PDF document text
    • https://sibanomo.weebly.com/uploads/1/3/0/9/130969588/mizusuritupo-novide.pdfIn PDF document text
    • https://cdn.sqhk.co/bowazeduz/v7ey7ji/tebipapis.pdfIn PDF document text
    • https://tomadukego.weebly.com/uploads/1/3/6/0/136083679/gosarawefu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408976/normal_5fd63c49b64a7.pdfIn PDF document text
    • https://cdn.sqhk.co/pegipoveridi/jgeQLSN/rokekojunavo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485436/normal_5fdd6053134dd.pdfIn PDF document text
    • https://cdn.sqhk.co/tavevalurov/VjeKhaM/best_bots_to_add_to_discord_server.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://purumurik.epizy.com/check_the_answer_to_a_division_problem.pdfIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_57d3a7fffff44f9d8d6ae51624c1f5f7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/wipotiramopobu.pdfIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_abbd0e42d1f2419081be93ab367fd049.pdf?index=trueIn PDF document text
    • http://jabelakejirer.epizy.com/polat.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/kubota_bx_250_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/what_are_5_reliable_sources_of_health_information.pdfIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_d94146c52f3d4bdfa8db57c6cef0a207.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/somamere/pflanzenbestimmung_nach_blattformen.pdfIn PDF document text
    • http://varoniwarovez.rf.gd/best_customer_service_cv_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/kopalarazexepipodugutum.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_off00010dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEC 5776 bytes
SHA-256: 04d80e4ec27944e34d060fe2d424d1f3bd6bdb17bcf49ab91536eff69abc83df
font_01_sfnt_off000121c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C5 11228 bytes
SHA-256: 0e3c32e042e15fe1472e71c824200ed02c8844683b78f9137151295b31c0dd10