Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa274e56356f3a0a…

MALICIOUS

PDF

82.4 KB Created: 2021-03-18 19:01:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da282d1f77499a6ef868cdca174cc53e SHA-1: 22e011c77ac619d6fa1e05c962d30d855d75b031 SHA-256: aa274e56356f3a0a136d3b7a3055c341bef8097fdc12244a965a57d8b02d4b34
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful sites.

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://ponafet.ru/123?utm_term=comedy+central+tv+guide+nz
    • http://rukakev.iblogger.org/52659790424.pdf
    • https://static.s123-cdn-static.com/uploads/4483873/normal_5fde9f5d2f8b2.pdf
    • https://juzajepilokak.weebly.com/uploads/1/3/4/6/134682244/644054.pdf
    • https://pipedexow.weebly.com/uploads/1/3/4/8/134852679/462144b421.pdf
    • https://cdn-cms.f-static.net/uploads/4486193/normal_6031193f9d0d9.pdf
    • https://static.s123-cdn-static.com/uploads/4454824/normal_5feba6f093431.pdf
    • https://dezijetide.weebly.com/uploads/1/3/4/8/134864221/lilelewoliforanimu.pdf
    • https://cdn-cms.f-static.net/uploads/4423453/normal_6052fb032a0cf.pdf
    • http://munumizirukotek.iblogger.org/83964273728.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zabevog/90063181468.pdf
    • https://s3.amazonaws.com/wetowuzuxit/introduction_yourself_template.pdf
    • https://84bc2af4-305a-40b7-847c-8c52cb6b08d2.filesusr.com/ugd/a2e525_7b540274fa0d4094a89ae3643fbee68a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/39fb357e-227c-4188-bfb6-f0fe8be18bdf/bunker_hill_security_dvr_software_download.pdf
    • http://lusunumef.rf.gd/jevoguforetonulozikoxe.pdf
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_54746f35f8234c4a8b982ab8682c018f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dfd71ef7-9a23-4ab4-bbd8-5b794427c42a/2_hour_job_search_tiara.pdf
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_24b1922e851844e6b45d64a7e7940b58.pdf?index=true
    • http://gelidug.epizy.com/autocad_lt_2021_requirements.pdf
    • https://s3.amazonaws.com/jevopemosod/coleman_powermate_service_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010328.bin
540ec77fb9c6ba372d4f5d09fc8f619524db1ca7962145be7cb3ee671962c11e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10328 5196 bytes
font_01_sfnt_off000114ce.bin
7552e95914a43db510735441a6f77b8567b587b7afefc1018ea005b0cb75e677		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114CE 11996 bytes

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