Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f610cba4fa086f2…

MALICIOUS

PDF

78.9 KB Created: 2021-02-26 20:20:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 24259178e8f0afe340dc0bb568ebb38e SHA-1: 6c17d032a62c0c9e43f5a7eaefff1e7e89f87ac6 SHA-256: 6f610cba4fa086f2821e374947aadc1609f5e2e0664110891d06627f6a3da5f2
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, identified as a link farm, with at least one pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL analysis suggest it's designed to redirect users to 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
  • 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.
  • 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://dafemum.ru/award?keyword=is+5x5+enough+to+build+muscle In PDF document text
    • https://cdn-cms.f-static.net/uploads/4469633/normal_5fea22d268a2c.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/client_services_manager_job_description.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/famobobilazevaxuta.pdfIn PDF document text
    • https://nogonosexenepe.weebly.com/uploads/1/3/4/6/134674491/7812320.pdfIn PDF document text
    • http://themarkuzmusic.com/17372689583cjwds.pdfIn PDF document text
    • http://chunyoo.com/how_to_draw_a_simple_cartoon_caraxc8r.pdfIn PDF document text
    • https://gabanifuvumot.weebly.com/uploads/1/3/4/5/134588994/nogiwugujifela.pdfIn PDF document text
    • https://lupuxamugegudi.weebly.com/uploads/1/3/4/6/134623484/872b0e.pdfIn PDF document text
    • https://cdn.sqhk.co/kavonalitego/gX4yjfe/lobster_trap_art.pdfIn PDF document text
    • http://rodsfish.club/13948828195y4shu.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/tuxutedi/sovarelun.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/95112380797.pdfIn PDF document text
    • http://kozogasivufi.myartsonline.com/womiwukujupolizemo.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/dipanafawoviriragip.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/cardi_b_live_performance_2019.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_off0000f949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF949 5316 bytes
SHA-256: e1db85e4bf981eaafa1af5d488396c0a8f3d3496046dfa9e4ef613f539758614
font_01_sfnt_off00010b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B48 10364 bytes
SHA-256: 4763f303ba421c76c8e88bc807045a5a615280c916568cb371e67ae0dc6e4fc9

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