Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ecca22f4b22fe1…

MALICIOUS

PDF

78.2 KB Created: 2021-04-04 07:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16c11069162799edfa42522df72f5592 SHA-1: 7daa593767c4aa7e277204c7c15a82e5f9b37e62 SHA-256: a2ecca22f4b22fe1054443c5f7dadab9cc53d76dfe18edfdda76d0146a057b6c
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, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/award?keyword=arkham+horror+deluxe+rulebook+pdf
    • http://dihtyar.online/6311017681suc4a.pdf
    • http://popuboloza.22web.org/android_games_free_site.pdf
    • http://wuramegojuluz.mywebcommunity.org/tudumuze.pdf
    • http://dotekebenutedex.scienceontheweb.net/visual_basic_books.pdf
    • https://static.s123-cdn-static.com/uploads/4485579/normal_5ff3dc6c01773.pdf
    • https://cdn-cms.f-static.net/uploads/4471253/normal_601b4b3841b90.pdf
    • https://cdn-cms.f-static.net/uploads/4454286/normal_602ea87dae4ff.pdf
    • http://mon-compte-cmb.best/601339209291they.pdf
    • http://vquest.website/doselomu297w5.pdf
    • http://nefritthebestthing.site/gevagefegosuvadinowusikviu8.pdf
    • http://manibupefif.mypressonline.com/adlerian_lifestyle_assessment_questionnaire.pdf
    • http://affilateapp.online/harley-davidson_service_schedule_prices_australiahaak6.pdf
    • http://sefajoga.iblogger.org/how_to_do_a_toga_out_of_a_bed_sheet.pdf
    • http://hookup681.site/wubidutalofudqfq5x.pdf
    • http://lemafesopeposuz.mywebcommunity.org/integrated_agriculture_aquaculture_a_primer.pdf
    • http://sitizinudex.getenjoyment.net/wimoziwawatani.pdf
    • http://mibotirekusiw.mywebcommunity.org/bt_home_hub_2._0_manual.pdf
    • http://evromotors.net/how_to_add_triangles_in_photoshopmsagy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://pojoviraxerojo.myartsonline.com/do_dyson_hepa_filters_need_replacing.pdf
    • http://detuzexowo.epizy.com/research_approach_meaning.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e641.bin
b95556b20e9a86ca28393b946fea03fb5445df54a8da8d3d3d6179cfbc84daf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE641 5012 bytes
font_01_sfnt_off0000f743.bin
74057886f7843e23e4112194e6e5566d2ce681cbd193544b52bfeb4eab927b3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF743 11544 bytes
font_02_sfnt_off00011d36.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D36 4324 bytes

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