Malicious PDF — malware analysis report

Static analysis result for SHA-256 be212e07d129b68d…

MALICIOUS

PDF

95.0 KB Created: 2021-03-01 10:41:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 06bb0b8b47b847c21c953063d7ec0225 SHA-1: a6fbfd2bfc74b59d42d8146acfc91db023dde5a9 SHA-256: be212e07d129b68d02dd6c73d28f958f0a6078ad26698570bf524928eb49faf4
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 domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document 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://resalured.ru/strik?utm_term=internal+combustion+engine+efficiency+curve PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469103/normal_5fdf0eb55b0a1.pdfIn PDF document text
    • https://xoluvaxabezil.weebly.com/uploads/1/3/4/3/134338990/motepafalobolopomedu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412584/normal_5fd6742c4aea6.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/liziremolote.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451930/normal_60234c8562f8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377114/normal_5fe1fac0e910e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426425/normal_603951bdd5b1c.pdfIn PDF document text
    • http://ninuxalezopo.getenjoyment.net/45838467767.pdfIn PDF document text
    • http://dajexori.mypressonline.com/66998457991.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/why_pilot_light_wont_stay_lit_on_furnace.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470980/normal_5fe9b00f89125.pdfIn PDF document text
    • https://warexuzema.weebly.com/uploads/1/3/4/6/134601764/dijulu_weweje_vukaj_xebukalito.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/iAjajf8/mcps_zoom_instructions.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387938/normal_5fde3b72acdbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423427/normal_5ffb91f5e3d3b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jeborawaleko.atwebpages.com/30378672861.pdfIn PDF document text
    • http://bexukavibume.myartsonline.com/what_are_complex_carb_foods.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_off00012fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA0 5440 bytes
SHA-256: 6dbf638fe090c4b45528888c2a804e5712ce9fb146dfd0e5a3ad9fc59e09d9cf
font_01_sfnt_off0001421b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421B 12760 bytes
SHA-256: f20cfc17b70a9930323cde34db529634277797f9869e1935d89b12d100012b57

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