Malicious PDF — malware analysis report

Static analysis result for SHA-256 e337d413b8738cc7…

MALICIOUS

PDF

80.3 KB Created: 2021-03-19 07:49:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: eb126ef3e1197ff212af746fcb2402da SHA-1: e41a512f9c520d10ab079c4b21689e2c869a597c SHA-256: e337d413b8738cc7a53297bb1773992e1e87d35aec4858f9a192c6cbd265d94d
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojanized document. It contains numerous embedded URLs, with a primary external URI pointing to 'https://resalured.ru/123?utm_term=script+outline+template+google+docs', suggesting a lure to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a non-clustered link farm on disposable hosting, reinforcing the phishing nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/123?utm_term=script+outline+template+google+docs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475392/normal_600359b598d1a.pdfIn PDF document text
    • http://mitimewigupito.mypressonline.com/how_to_use_ready_mix_concrete.pdfIn PDF document text
    • http://file-id.ru/7567941707385ri7.pdfIn PDF document text
    • http://lesantyqas.online/75931072178leno4.pdfIn PDF document text
    • http://odemebayisitrafik.com/11th_science_biology_textbooktthcp.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/do_chipmunks_have_stripes.pdfIn PDF document text
    • http://malanefire.sportsontheweb.net/how_to_make_homemade_shooting_sticks.pdfIn PDF document text
    • http://wulixiv.sportsontheweb.net/target_market_analysis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454426/normal_5fcf2c3ae2842.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477183/normal_6002164caca34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411479/normal_5fe36504071c0.pdfIn PDF document text
    • http://sebevifa.getenjoyment.net/principles_of_physics_11th_solution.pdfIn PDF document text
    • http://gadatoreneperil.mygamesonline.org/advanced_concrete_materials.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374978/normal_5fef34cb18874.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490140/normal_5ffc2ad116db6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zisukuvi.atwebpages.com/wivabigamazasazekagabixe.pdfIn PDF document text
    • http://xekazaz.myartsonline.com/munugirokorevebagi.pdfIn PDF document text
    • http://kisalonokexiwi.atwebpages.com/14767046750.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_off0000f62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62A 5496 bytes
SHA-256: a535222a6b6aaed0e3de01791f6c8c7fe0d237dd162a87605516341879ef2d43
font_01_sfnt_off000108bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BD 13444 bytes
SHA-256: 67e0faee5c6af6ad7e1ce4b1cd85e14fd0ae825f0d54b2c64df2f82f0ffee0a1

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