Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5dbfd5dd5e7016…

MALICIOUS

PDF

67.1 KB Created: 2021-02-16 01:51:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ccb5eff1b81672dbdd92a207436ef88d SHA-1: 5624c1331f3fab769ccd649f7fb4f5e6a80f1c25 SHA-256: db5dbfd5dd5e701690130d3c1843f3a12dce5b0e5f3ea6f8c70f8344712d89d5
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, yafferge.ru, which is likely used to host or redirect to a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to school schedules, aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/wix?keyword=dr+phillips+high+school+bell+schedule In PDF document text
    • https://cdn.sqhk.co/sivunukiwe/dcXfjbw/master_thief_5e_stats.pdfIn PDF document text
    • https://cdn.sqhk.co/zanemulazif/ieAhaBq/zizafojewixoto.pdfIn PDF document text
    • https://cdn.sqhk.co/zowolanazew/YRigchb/download_big_battle_3d_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/mixenezir/AhjzOic/47722784186.pdfIn PDF document text
    • https://cdn.sqhk.co/xibexowufifu/Fiefjfl/joe_rocket_thermal_liner.pdfIn PDF document text
    • https://cdn.sqhk.co/rogapakaler/LhjidfE/nuzojidesetijelavomiregi.pdfIn PDF document text
    • https://cdn.sqhk.co/busosuwik/UKYDNdJ/ecology_auto_parts_chula_vista_inventory.pdfIn PDF document text
    • https://cdn.sqhk.co/puwukuwos/hjihhjc/tovirofimog.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/UGOijxe/95093340501.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/gk2v54T/sobosilosid.pdfIn PDF document text
    • https://cdn.sqhk.co/dilereku/pbK6Rha/triominos_online_gratis.pdfIn PDF document text
    • http://ihsteam.ru/excel_protect_workbook_vs_worksheet5eqp7.pdfIn PDF document text
    • http://differencecheats.net/5023875441a1mct.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/dKUgjjh/64211679169.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/rimejiguvif/padegiwomi.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_off0000ca97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA97 5264 bytes
SHA-256: be341116916f310274f08c516b55af62c810ac0ac90ede4fee359b021f2af3c0
font_01_sfnt_off0000dc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC78 10268 bytes
SHA-256: d2e8e9a44815be43f58276e654489c33e1dd2404a62c0c1f739e2cb14ce9e283

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