Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3cb6565e985ecff…

MALICIOUS

PDF

77.5 KB Created: 2021-04-08 00:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c659fca2d81b585e089039d7f175e88a SHA-1: 6a96f88f7cce9c8ef70e6ef600319b5b7ac6c22e SHA-256: f3cb6565e985ecff7361d8255a96779271a3af2aadfcb0e852b45fb3bccd59a2
156 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 potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. The ClamAV detection further confirms its malicious nature. The document body, though heavily obfuscated, suggests a lure related to educational institutions, likely to trick users into visiting these external sites. No scripts were extracted, but the overall structure and link farm point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=best+school+for+public+administration+in+nigeria
    • https://cdn-cms.f-static.net/uploads/4388428/normal_5fe9abb9c1e24.pdf
    • http://quickpapp.online/linik8k3pl.pdf
    • https://static.s123-cdn-static.com/uploads/4426832/normal_5fe07072afa51.pdf
    • https://cdn-cms.f-static.net/uploads/4446374/normal_604d0253f2f0a.pdf
    • https://static.s123-cdn-static.com/uploads/4489054/normal_5fdd628f707eb.pdf
    • https://static.s123-cdn-static.com/uploads/4408323/normal_5fdc9dc648452.pdf
    • https://cdn.sqhk.co/junikesiza/MicsjjG/14851240945.pdf
    • https://cdn-cms.f-static.net/uploads/4390660/normal_6052a9a307498.pdf
    • https://cdn-cms.f-static.net/uploads/4482636/normal_60243cf9cf047.pdf
    • https://cdn.sqhk.co/dowotovewi/pgdQ2Xj/truck_simulator_europe_2_uptodown.pdf
    • http://formverifiedbadge.com/gebopuvawxikm.pdf
    • http://republvinb.fun/sufudefuwifusopokebokoks12db.pdf
    • https://cdn-cms.f-static.net/uploads/4444636/normal_603a59c5cd829.pdf
    • https://cdn-cms.f-static.net/uploads/4445737/normal_606684c759a4b.pdf
    • https://cdn.sqhk.co/kigimole/uR49uih/lebara_top_up_plans_5_pounds.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tudawufed/catalogo_mary_kay_2018.pdf
    • https://fe4fa097-7109-4367-a76b-bc1f2b7936f3.filesusr.com/ugd/ef6f93_3e66b5beb48b4f36b6026591a33d9ceb.pdf?index=true
    • https://s3.amazonaws.com/vuxagixil/16685642357.pdf
    • https://s3.amazonaws.com/gajakelegeza/best_offline_android_games_hd_graphics.pdf
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_1368bf81c9e842f3932481aa5db0c6f3.pdf?index=true
    • https://s3.amazonaws.com/lebaxa/what_is_the_best_dog_clippers_to_buy.pdf
    • https://04650017-3ca5-4b28-9d9b-11da2816551d.filesusr.com/ugd/aa03de_f27a3061fdd346d79a7e02e6334a669d.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb7.bin
813e8f001e09cd275173cd0ee46a8cae35fb672d3b81d90160ebc281511a9bcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 5760 bytes
font_01_sfnt_off0001012b.bin
608478b60612b784df97e0ed2eaf878d4de92dbeefeca537b0bf627ae9d17b37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1012B 10956 bytes

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