Malicious PDF — malware analysis report

Static analysis result for SHA-256 84dc173552281a97…

MALICIOUS

PDF

77.2 KB Created: 2021-02-26 12:41:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4f32fbfcfb36f5a04bb28fea09094f29 SHA-1: de8972741b4831598993196931837e30d1ef5907 SHA-256: 84dc173552281a97d69f12196e520ce8a654e0ba83244535d8cb9116c89d5e4b
156 Risk Score

Malware Insights

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

This PDF document is classified as malicious, exhibiting characteristics of a phishing lure. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The primary URL, 'https://baarspo.ru/strik?utm_term=why+does+my+bluetooth+soundbar+keep+disconnecting', is likely part of a phishing campaign aiming to trick users into clicking for technical support. While no scripts were explicitly extracted, the PDF structure and extensive link farm indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://baarspo.ru/strik?utm_term=why+does+my+bluetooth+soundbar+keep+disconnecting PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450003/normal_5ffb34022cc39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370530/normal_5fcc769127b9e.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/dgjNBjc/gmx_cloud_download.pdfIn PDF document text
    • https://datugabow.weebly.com/uploads/1/3/4/7/134745554/rusewimobakaxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409244/normal_600c9852cda43.pdfIn PDF document text
    • https://wofirifitobad.weebly.com/uploads/1/3/4/3/134310136/2555410.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367310/normal_5ff031be1922d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484639/normal_5fd1ac26cee90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500208/normal_5feb3fa61a727.pdfIn PDF document text
    • https://fosegeluka.weebly.com/uploads/1/3/4/7/134717840/679f69cfe75d29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495413/normal_5feeeea42e572.pdfIn PDF document text
    • https://zupevojug.weebly.com/uploads/1/3/0/7/130740492/2675947.pdfIn PDF document text
    • https://cdn.sqhk.co/zikonidenijo/gjfLjhh/backhanded_compliments_from_husband.pdfIn PDF document text
    • https://cdn.sqhk.co/wemonamo/hdHheia/emergency_room_technician_jobs_san_diego.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488332/normal_5fd33259868d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468814/normal_600bcaa00f55f.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/ehc9rYc/vawemanajafadinaxesa.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/nge6GQe/91146904803.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ee40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE40 5804 bytes
SHA-256: 96a7fe46fb28e9bea4ef9851c567f78f5e7a2f6a754bd0fe49a81d4215f3ddae
font_01_sfnt_off000101e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E8 10952 bytes
SHA-256: 19f8d34d6d84fa9eefb7682f770c2045f7a8daad9dbaa519fb77f1dc2e6fec49

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