Malicious PDF — malware analysis report

Static analysis result for SHA-256 c364a13136ff0330…

MALICIOUS

PDF

64.2 KB Created: 2020-12-30 21:05:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c01066327c6d1b6298eefd9fb8bee46f SHA-1: e73787f77894b42b781b89828b8cf85af6075b05 SHA-256: c364a13136ff03300f355dbbc01dfa226bad59643b504faa34f4f5ee650a4926
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable domains or redirectors, indicating a link farm designed to drive traffic to malicious sites. The heuristic firings confirm the presence of malicious redirector links and a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=bushel+with+ibex+motifs+khan+academy In PDF document text
    • https://cdn.sqhk.co/reretukida/Ehihfjj/rope_swing_chair_stand.pdfIn PDF document text
    • https://deriwofapavuz.weebly.com/uploads/1/3/4/3/134311795/9486818.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459170/normal_5fd968a6972f9.pdfIn PDF document text
    • https://sipavokipepino.weebly.com/uploads/1/3/4/3/134330850/zixuxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465015/normal_5fba1d99b4347.pdfIn PDF document text
    • https://burevojaziji.weebly.com/uploads/1/3/4/7/134729690/44730b3267.pdfIn PDF document text
    • https://mipumitazolepi.weebly.com/uploads/1/3/4/4/134495795/zesizekileros.pdfIn PDF document text
    • https://gidepojijozi.weebly.com/uploads/1/3/4/2/134235950/1432a119.pdfIn PDF document text
    • https://sixapinipuso.weebly.com/uploads/1/3/1/3/131384402/9875350.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/nuxulikiwab/39154000469.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/nice_guidelines_menopause_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/html5_dashboard_templates_free.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_off0000bfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC6 5680 bytes
SHA-256: d0d7e9319180a7848d077e8e3d556c86ba03ad0d7a8bffc97a534e025e6e8637
font_01_sfnt_off0000d311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD311 9784 bytes
SHA-256: 1f128dbc8d2e1f7a6eed9530b69c1378c46d9828e193770e7b695c98d878e558

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