Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d131ce6500047f9…

MALICIOUS

PDF

89.1 KB Created: 2021-04-22 07:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e5b14bbb438ad7e4a4fc3fba4abe7a46 SHA-1: aa0ff07c89f89e39a1cbade8ecfd985eee0fa9ac SHA-256: 1d131ce6500047f9aa3ddd7c6d3e80cc8ebbc7825430b38bf12175fae15c5997
266 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF document employs multiple lures to trick the user into downloading a malicious payload. It impersonates Facebook and suggests installing a remote support tool, while also providing a link to a suspicious URL that likely hosts the secondary stage. The presence of numerous external links and the ML classifier's high confidence score indicate a malicious intent to deliver malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://dugedepap.ru/strik?utm_term=resound+phone+clip%252B+app.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://dugedepap.ru/strik?utm_term=resound+phone+clip%252B+app PDF link annotation
    • http://zokoxakabu.medianewsonline.com/rukazumipofipoboti.pdfIn PDF document text
    • http://rusakadovub.sportsontheweb.net/birla_sun_life_mutual_fund_common_application_form_download.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/jasgfZv/97605820530.pdfIn PDF document text
    • http://fopokigife.mywebcommunity.org/how_to_clean_voldyne_5000.pdfIn PDF document text
    • http://zujejilolo.scienceontheweb.net/neumonia_viral_pediatria_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/cijPGzL/u_mobile_center_johor_bahru_contact.pdfIn PDF document text
    • http://tuwasukam.getenjoyment.net/lololome.pdfIn PDF document text
    • http://fumumowovufa.mywebcommunity.org/acid_rain_causes_and_effects.pdfIn PDF document text
    • http://nomokesus.sportsontheweb.net/kurevakufejub.pdfIn PDF document text
    • https://cdn.sqhk.co/zozevuxe/dNRjiol/grammar_for_writing_workbook_grade_12_answers.pdfIn PDF document text
    • http://luloxijemise.medianewsonline.com/tafsir_al_mulk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/watobop.pdfIn PDF document text
    • http://tamefizorala.epizy.com/tematyczny_sownik_polsko_angielski.pdfIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_5aabaeacd5bb450db67633e00db679b9.pdf?index=trueIn PDF document text
    • http://ximuxulizi.myartsonline.com/2324738872.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/86120762975.pdfIn PDF document text
    • http://fadojogepu.epizy.com/rubabadatulotepira.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/business_environment.pdfIn PDF document text
    • https://d920bd67-dfaf-4c99-85b0-fcb8118dfb91.filesusr.com/ugd/383849_72ecc1a432b0461aaca459548ee27f49.pdf?index=trueIn PDF document text
    • http://merujepapi.epizy.com/il_canzoniere_saba.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/guide_du_routard_equateur_amazon.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_1e10e33d1054418a90b0477126d0c12b.pdf?index=trueIn 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_off00011f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F63 5072 bytes
SHA-256: 3066cbaba1b7c9ee95ccb9b918a28999e08c9ad7d095a57458422fdcf4f5129a
font_01_sfnt_off000130a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A6 11160 bytes
SHA-256: 1fb0fabe320cfa74938ce5d9288a0f5441a8603b58b8f454928c04672b908fea

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