Malicious PDF — malware analysis report

Static analysis result for SHA-256 37746ac553febc7b…

MALICIOUS

PDF

66.4 KB Created: 2021-02-11 07:30:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: f5022735983f410ff17f683ee85dc2df SHA-1: 51f492e3c36fb9da6533d1c9e2643aacb3f68b5e SHA-256: 37746ac553febc7b71e2e27900d3b5a731860104c1dfae5edaacc59b2b6492d4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://leonvi.ru/123?utm_term=pendleton+police+department+jail+roster PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402503/normal_5fd8ebc89fc98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402244/normal_5ff206b6d9d09.pdfIn PDF document text
    • https://cdn.sqhk.co/vivutazawi/Vqp7Rza/bigazujidav.pdfIn PDF document text
    • https://cdn.sqhk.co/mapexovebo/jeghuFF/61537267975.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487186/normal_5fe5ee06273fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496584/normal_6010c48e99bc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449600/normal_601448b85ad0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426060/normal_6015c552788e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384307/normal_5fcf297f3206f.pdfIn PDF document text
    • http://dorodirebupekel.iblogger.org/19701415059.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448121/normal_6006dc5f497ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500446/normal_6002e4d8b0528.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373749/normal_6003ddff46a45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491450/normal_602165eba85f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468551/normal_5fdf63ec9ccc2.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvupalib/jicodjb/48106430769.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://biborufa.epizy.com/69123924611.pdfIn PDF document text
    • http://wilirumam.rf.gd/linen_bed_sheets_melbourne.pdfIn PDF document text
    • http://palalujopaxuv.epizy.com/boat_trailer_guides_for_large_boats.pdfIn PDF document text
    • http://riramemixezu.epizy.com/lspdfr_0._4_install_guide.pdfIn PDF document text
    • http://dujizadixupodur.epizy.com/bts_songs_ilkpop.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_off0000c788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC788 5296 bytes
SHA-256: 447c663fc248d7bae42344abb37d9bbe258c421877bf1b45143730f1d70d1588
font_01_sfnt_off0000d971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD971 9968 bytes
SHA-256: 4b16ff4c8c48bb97e25dfef0af79c086f3ca07b40820009f039aaf50281015bd

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