Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9cc7ec6532bcae…

MALICIOUS

PDF

71.2 KB Created: 2021-03-27 22:30:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 57f876f6a5e8fb58b0c8489c2a6a13b9 SHA-1: 6b9782954d4700fccab7fea54742d9aadeb496fb SHA-256: 3b9cc7ec6532bcae80c34fe41c4ce10a09abad7df85e15ff6075eff88b63aa8d
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with a high concentration of links on disposable hosting, indicating a link farm designed to redirect users. The embedded content, though heavily obfuscated, suggests an attempt to disguise the malicious intent by presenting seemingly innocuous text.

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://gimoguvi.ru/strik?utm_term=what+is+chemistry+like+in+high+school PDF link annotation
    • http://jepewadagamer.scienceontheweb.net/xoguxonogodo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369772/normal_5ff717c6e8834.pdfIn PDF document text
    • http://begdas.space/virtual_classroom_website_templates_free_downloadwdg2r.pdfIn PDF document text
    • http://update-win20.online/715148169270xj77.pdfIn PDF document text
    • https://bevabuje.weebly.com/uploads/1/3/4/8/134897483/vokokamixeja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527108/normal_601156194fb5c.pdfIn PDF document text
    • http://20970907.net/the_devotion_of_suspect_xikym8.pdfIn PDF document text
    • https://lemapemoj.weebly.com/uploads/1/3/4/0/134040436/nimutawuse_lonolebezofop_sizimu.pdfIn PDF document text
    • http://waxedeb.getenjoyment.net/cisco_ccna_200_301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485443/normal_605389f19dedf.pdfIn PDF document text
    • http://shtangye.xyz/kukavidelulufomivegegelobmeqc.pdfIn PDF document text
    • https://zagodifibom.weebly.com/uploads/1/3/0/7/130775293/zefuja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/bram_stoker_draculas_guest_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/guwapiwopidixidavobe.pdfIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_04e0ead94a27413a80a5ae3f0fe0372e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/psychiatric_mental_health_nursing_10th_edition_test_bank.pdfIn PDF document text
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_043298d951824350a52299edd6176a20.pdf?index=trueIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_085fba52833f4667aa0554ddedba2c65.pdf?index=trueIn PDF document text
    • http://rexefobixavater.myartsonline.com/nietzsche_beyond_good_and_evil_hollingdale.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/50718370905.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_off0000d927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD927 5392 bytes
SHA-256: ed783dd87d5d684aa70a8b9f04f3c4b8b00f2b11eca7b3b579f9a548319051bd
font_01_sfnt_off0000eb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB65 10556 bytes
SHA-256: 367dca04d9f9c635289b67641d758456157775a6cfd52cc22d7142bf459373e4

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