Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8632be82b3b2711…

MALICIOUS

PDF

80.5 KB Created: 2021-02-28 09:48:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 240b4170b11b5bbac49f8e5c14ed7bd7 SHA-1: c62f1c8dce40bfe3e5852eff9d294d6e767f894e SHA-256: f8632be82b3b27117097896313a4b5afa5337c1d91f20e7ccd085b46706c0e17
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external URLs under the guise of providing study notes. The primary malicious URL identified is https://mezovuduw.ru/strik, which is likely used for phishing or to serve a second-stage payload. The PDF's structure and the presence of multiple external links on disposable hosting indicate a deliberate attempt to distribute malicious content or redirect users to fraudulent sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://mezovuduw.ru/strik?utm_term=letter+from+a+birmingham+jail+sparknotes PDF link annotation
    • https://torovuzexas.weebly.com/uploads/1/3/2/7/132710592/b2df268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369141/normal_5fdc3ef163847.pdfIn PDF document text
    • https://kobuzonoge.weebly.com/uploads/1/3/1/4/131452837/8b64bd2d0e65.pdfIn PDF document text
    • https://nisaxiguxizi.weebly.com/uploads/1/3/5/3/135306566/b3ee65426ae29.pdfIn PDF document text
    • https://pepizowa.weebly.com/uploads/1/3/2/7/132711999/5420981.pdfIn PDF document text
    • https://kewegiru.weebly.com/uploads/1/3/1/4/131438086/1353982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485572/normal_5fe89f0bbc0dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421039/normal_5ff685c0b311a.pdfIn PDF document text
    • https://tebudewuve.weebly.com/uploads/1/3/2/6/132683230/1874939.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463010/normal_601e20ba68b66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444100/normal_5fcdab06e0ce1.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/muxozuvalubi/55466822236.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/divadasaf.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_off0000fda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA1 5536 bytes
SHA-256: ddd97158a509a8b253f04444f5f1eea0408f687b7461dbdfc320cc8471548edd
font_01_sfnt_off00011057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11057 10836 bytes
SHA-256: 990e2a76d2ab7bbdcc82582843d144d6e599fb18d7d9463bdce4cd9967f67a1c

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