Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b0ba3e163a7ca3…

MALICIOUS

PDF

81.0 KB Created: 2021-03-02 23:00:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 95d100a2c5f1c0e372a8e0873ddaacf3 SHA-1: 71cf3515951cf75fee519e555be73f7c0f41ddde SHA-256: c3b0ba3e163a7ca3338ff0d8e9d094d9ca570f559b49949cf1dccf9cf566c5dc
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/wix?keyword=north+european+plains+have+rich+deposits+of PDF link annotation
    • http://bcipreactivaperu.com/vuguxugudolibupitesimutq226.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402261/normal_5fc598cbc490e.pdfIn PDF document text
    • http://makamar.xyz/11387565761aiua0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380229/normal_601fc9f829cba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://supapimegem.rf.gd/68089980010.pdfIn PDF document text
    • http://tamedigozetot.epizy.com/midland_x_talker_t20x4_manual.pdfIn PDF document text
    • http://suwugiborewetel.rf.gd/gidedemegipalaxawinuz.pdfIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/how_to_reset_a_kindle_3.pdfIn PDF document text
    • http://nupusadulawux.epizy.com/acrobat_professional_dc_2015.pdfIn PDF document text
    • http://zarusorujot.epizy.com/actemra_sc_bula.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_off000102d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D3 5272 bytes
SHA-256: 7e93b709a441d82a2b9d227a49ff20761554136deaa08b12882ccfaa9499dca4
font_01_sfnt_off000114c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C7 10032 bytes
SHA-256: 3ff6b69782da97574570990e35fdaa190b5bca706b87f7675c0be7609eb8e551

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