Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea51e5c08640f9b9…

MALICIOUS

PDF

75.2 KB Created: 2020-12-28 21:33:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 69705266f48a875522ab45b233725e91 SHA-1: d0b07b52c7de4eb60d29718edbe466d6a0fc8d0d SHA-256: ea51e5c08640f9b9b7531d9b90d9d18711699c6cf238b33eff9f4ead3c84ce77
244 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to known malicious redirectors or disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/strik?utm_term=french+coffin+nails+long In PDF document text
    • https://powilumoratome.weebly.com/uploads/1/3/4/3/134368047/foxadekezige.pdfIn PDF document text
    • https://gumarifubora.weebly.com/uploads/1/3/4/4/134465571/zafefatit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374189/normal_5f99cc619b7f2.pdfIn PDF document text
    • https://jupovibofekek.weebly.com/uploads/1/3/4/4/134490290/9987a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417648/normal_5f995f23c7e7b.pdfIn PDF document text
    • https://minufufigazibur.weebly.com/uploads/1/3/4/5/134528603/wikiwopusuxokam.pdfIn PDF document text
    • https://dubevatuw.weebly.com/uploads/1/3/0/9/130969539/gosejudirodoreligopa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500665/normal_5fe45db113b1d.pdfIn PDF document text
    • https://dogewirezuv.weebly.com/uploads/1/3/4/6/134699505/4571976.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd775f07-0057-4387-baad-e34228457168/hold_the_door_meme.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/77123482808.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/friendly_letter_writing_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54A 5100 bytes
SHA-256: 6b61fcbca0921ef6e9d236882d90f028cd74efe84ad3fb5ab7b537e2467cd9dc
font_01_sfnt_off0000e6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A2 10700 bytes
SHA-256: 97786b302a1c2678485f3e09c7e50869103ab8f8079355344518c6fd680029cb
font_02_sfnt_off00010b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1D 16060 bytes
SHA-256: ae97ebdbf5cb6679ee3ae7f6f8963da9ec2437ada1f672a33085bc8cbe806833

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