Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52916f46c6bcb34…

MALICIOUS

PDF

69.4 KB Created: 2021-06-08 23:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1166405dce45b91e5ada83c008d5a081 SHA-1: d7f288605c263e74d0862dac624f4e6cc16c2398 SHA-256: d52916f46c6bcb343342cf2f2f22270c2f3d81cea145fe6667c38f13cf017b6f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via the linked PDFs. No scripts were extracted, but the presence of numerous external URIs suggests the primary function is to redirect users to potentially malicious content.

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://pistant.ru/pbw?utm_term=3d+shapes+formula+surface+area+and+volume PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381988/normal_6058fbae1179d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450890/normal_6007633632ce0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413012/normal_600bf223f308d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374517/normal_5ff272f3db343.pdfIn PDF document text
    • https://vafuxukosa.weebly.com/uploads/1/3/4/4/134440110/2067e427aa2.pdfIn PDF document text
    • https://gatilavim.weebly.com/uploads/1/3/4/3/134391542/tavug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428341/normal_601a11a7b740e.pdfIn PDF document text
    • https://sijazeresivex.weebly.com/uploads/1/3/4/5/134502522/0cb7443870ddf6a.pdfIn PDF document text
    • https://jekotufuwin.weebly.com/uploads/1/3/1/4/131406020/9780312.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393369/normal_606130c819670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480889/normal_602c6d7d272d9.pdfIn PDF document text
    • https://dekupepevimozis.weebly.com/uploads/1/3/0/7/130738652/wakofamebug.pdfIn PDF document text
    • https://topejaliwas.weebly.com/uploads/1/3/4/3/134305960/417604.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xifilipisi.pbworks.com/w/file/fetch/144414102/how_to_get_free_fire_advance_server.pdfIn PDF document text
    • http://nuxawakaxaz.pbworks.com/w/file/fetch/144728328/reporum.pdfIn PDF document text
    • http://mabigeroxoso.pbworks.com/w/file/fetch/144767853/how_do_you_find_the_mass_number_of_element.pdfIn PDF document text
    • http://vedufid.pbworks.com/f/nokixijolewuma.pdfIn PDF document text
    • http://mikabipi.pbworks.com/w/file/fetch/144724734/pelicula_completa_en_espaol_latino_sonic.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/how_to_read_refrigerant_pressure_temperature_chart.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_off0000d060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD060 5524 bytes
SHA-256: 2cdff1d54f2f0d8a323d92c08658503bcafe436bda8fdc119abdefcd5c6bacc0
font_01_sfnt_off0000e306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE306 10832 bytes
SHA-256: a6c8a6974811a83f1f5a9d203a446a1e1abe7ff5f75d855cada54a30aa28b961

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