Malicious PDF — malware analysis report

Static analysis result for SHA-256 7617fcaaecebcb30…

MALICIOUS

PDF

98.0 KB Created: 2021-02-14 05:24:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 81cb2e5544b4d5141fa39d29f776bf7b SHA-1: 509f8e06963fd836f1eb447ab47ed9b067a44505 SHA-256: 7617fcaaecebcb30ba0b0068b74970dfca23a3166d3177ab18e2fdbf5cdde100
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including ClamAV detection and an ML classifier. It contains a large number of embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm designed to lead users to malicious sites. One specific URL identified is https://yafferge.ru/123?utm_term=wow+project+ascension+builds.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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.
  • 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/123?utm_term=wow+project+ascension+builds In PDF document text
    • https://cdn.sqhk.co/vemunaxudug/hgjdCid/can_crows_eat_eggs.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/dPbFjgS/my_cloud_home_app_for_windows.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378605/normal_5fe88f75af294.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/Ljcmjag/battlehand_heroes_ios.pdfIn PDF document text
    • https://navojinalano.weebly.com/uploads/1/3/4/7/134755450/12f6f341cd3cd74.pdfIn PDF document text
    • https://cdn.sqhk.co/letopoto/jiiaveB/business_calendar_2_pro_ios.pdfIn PDF document text
    • https://zojopufowe.weebly.com/uploads/1/3/4/5/134523349/466e8f6.pdfIn PDF document text
    • https://buvokatawun.weebly.com/uploads/1/3/1/3/131378806/e8a7d41c32.pdfIn PDF document text
    • https://fojomuku.weebly.com/uploads/1/3/4/4/134447263/bapibalurerefu_xukodu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413368/normal_5fc731e77a653.pdfIn PDF document text
    • https://jeratevi.weebly.com/uploads/1/3/0/7/130774970/pubitejewe-tumanuxenemi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kitakilesa/technical_support_engineer_resume.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/clear_search_history_android_internet.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6E 5268 bytes
SHA-256: 164ccb157f546d94469196887a78ad565c5c750c299b5b15429b15f234b64ac5
font_01_sfnt_off0001306e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306E 11184 bytes
SHA-256: df84718ab785d923fbd990802d69e3a99cce7e0945e4448a216fbaffb8a57c28
font_02_sfnt_off000156d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D5 16296 bytes
SHA-256: 15128285344048d76b584a6587ab2ccb2c75eee889948d4c665368cae9e92c8f
font_03_sfnt_off00016c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C52 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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