Malicious PDF — malware analysis report

Static analysis result for SHA-256 07d63b3141c901bc…

MALICIOUS

PDF

76.8 KB Created: 2021-02-20 21:53:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2b573fce468910626234ba7dfa12a89c SHA-1: c6c87067c24d12056db9411e7ddc5975b7f0a8a6 SHA-256: 07d63b3141c901bcad8230a493325bec6dfcbbbb9cc8678a00ebf5dcd482c987
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or facilitate phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it's designed to redirect users to potentially harmful 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://bologen.ru/wb?keyword=present%20perfect%20past%20simple%20present%20perfect%20continuous%20exercise%20pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413982/normal_5fe2be2587378.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478688/normal_60015ab63f70e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499309/normal_5fd1e1f97722b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489846/normal_5fe2f6fc00276.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/gjrggrC/53464196345.pdfIn PDF document text
    • http://cocobuka3.xyz/50_mathcounts_lecturesdzkze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385410/normal_6016fdaa74dd6.pdfIn PDF document text
    • http://evatopshop.xyz/bipunirujafudiluzaxusoladu29t5.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/marathi_artistic_fonts_freedlz78.pdfIn PDF document text
    • https://rurevudo.weebly.com/uploads/1/3/4/2/134265418/c83925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482190/normal_60242308f222b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460266/normal_5fda731815c64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446390/normal_6025c45b12f42.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/fjehKzO/jajonu.pdfIn PDF document text
    • https://nemaxololele.weebly.com/uploads/1/3/5/3/135304154/86b027b389.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/je9MsEU/18854111416.pdfIn PDF document text
    • http://snatural.space/132272955233234q.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_off0000eece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECE 5372 bytes
SHA-256: af082a3b0a938f5f5f302020b81d741c106abc3b4c819337312835574fde38ad
font_01_sfnt_off00010101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10101 10716 bytes
SHA-256: 0eb06dc31f258a39a2e6b7faa8bebc9d349c8ebac0e53e45f08ea3a3ffad1305

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