Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb59522c233a5c2c…

MALICIOUS

PDF

77.2 KB Created: 2021-05-31 20:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8d4413240ae8687e293fd00b42ebaf46 SHA-1: fa8af73ae4f00207e65e09cdd7ac6d0bebe56c54 SHA-256: cb59522c233a5c2c7790144078d881ace0aca2d65d2f597d96d9ce0f91faa4fd
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://dugedepap.ru/123?utm_term=checkers+hyper+specials+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4456667/normal_60031f3bbcbe3.pdfIn PDF document text
    • https://dulowufokupi.weebly.com/uploads/1/3/4/4/134495444/0d113cfe9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379054/normal_600d87797030f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456135/normal_601f272b2d6ef.pdfIn PDF document text
    • https://nugekowu.weebly.com/uploads/1/3/4/5/134587082/manovud_xinalo_nanus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490950/normal_5fe6f2cdeaf65.pdfIn PDF document text
    • https://fopizute.weebly.com/uploads/1/3/4/3/134315067/nasisokamud_lalokikajis_lowusiwutuwazin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455642/normal_60437c86806fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407807/normal_604b033405a07.pdfIn PDF document text
    • https://satuvimafinob.weebly.com/uploads/1/3/0/7/130739393/nafewim_vobojemipu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471711/normal_5fe040dff2e0a.pdfIn PDF document text
    • https://ziwagugo.weebly.com/uploads/1/3/4/1/134131511/kalifutof.pdfIn PDF document text
    • https://zijuwufe.weebly.com/uploads/1/3/7/5/137518410/a28201.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368767/normal_6043ed2f1739d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481056/normal_5fe7c211bbbc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448535/normal_5fdb9a3abb69e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392237/normal_602e3b4cafea0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445337/normal_5ff4ec83dd062.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406228/normal_5fc7589385b55.pdfIn PDF document text
    • https://pudasebedizut.weebly.com/uploads/1/3/4/5/134587980/e7921e66bebd17.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mefijunov.pbworks.com/f/40031736624.pdfIn PDF document text
    • http://palixazoke.pbworks.com/f/sujizodakuz.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144412230/lepivoxisenunatafezosa.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/w/file/fetch/144412794/can_a_man_build_muscle_after_40.pdfIn PDF document text
    • http://nagomax.pbworks.com/w/file/fetch/144421653/verbs_followed_by_ing_form_or_infinitive_exercise.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_off0000ef45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF45 5316 bytes
SHA-256: ca63c5f18b1863f5924a426578e44b5baa25e35a0fe9efc4250b70fcd69ad0a1
font_01_sfnt_off00010159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 11072 bytes
SHA-256: a6556eceffcaec03e35586321a0fb14ce55bbf0ed9c8320d359f67f8e32e13ec