Malicious PDF — malware analysis report

Static analysis result for SHA-256 168a6d78c44e3e52…

MALICIOUS

PDF

81.4 KB Created: 2021-02-14 16:19:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 984f370d70edd1390d26fc52b5337d59 SHA-1: 773ba9d39f86b2f73f607c1c0a7d8524f93dd2f4 SHA-256: 168a6d78c44e3e52ffd195858b88e183127256bc30e8c818afa7b375beb65537
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically referencing 'ultra keto burn shark tank episode', suggesting a phishing or scam lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially 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://seumenha.ru/123?utm_term=ultra+keto+burn+shark+tank+episode PDF link annotation
    • http://profaudit32.ru/dmso_peak_nmr6wq15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468572/normal_60226f6654592.pdfIn PDF document text
    • http://groby-ritual.online/wobupexek5127.pdfIn PDF document text
    • http://burutevopu.iblogger.org/war_chess_3d_for_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450634/normal_6005d350d82f0.pdfIn PDF document text
    • http://salonop.xyz/xazilewozanuvefaxeos2.pdfIn PDF document text
    • http://jumbochecker.com/fruit_splash_water_images5ythm.pdfIn PDF document text
    • http://ruroraratotu.66ghz.com/lagu_shinedown_simple_man.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421365/normal_5fe61d11ed486.pdfIn PDF document text
    • http://onenature.space/lesipegoduzijuzakuftd6ye.pdfIn PDF document text
    • http://lidzadva.xyz/dracula_oxford_bookworms_downloaduu8rh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374517/normal_6012eb9c06117.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://livugaxoretedop.epizy.com/jazz_piano_sheet_music_free.pdfIn PDF document text
    • http://nupopejif.epizy.com/35675073505.pdfIn PDF document text
    • http://bumojito.rf.gd/characteristics_of_neolithic_revolution.pdfIn PDF document text
    • http://rawupul.rf.gd/irregular_plural_nouns_test.pdfIn PDF document text
    • http://godutiliwaganos.rf.gd/11th_half_yearly_answer_key_2018_commerce.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_off0000ffce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCE 5240 bytes
SHA-256: dbf52163d449e743129746454d17c508984ea1181ab45d958715159723f7d698
font_01_sfnt_off0001118f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118F 11416 bytes
SHA-256: a5660ececc2577b5fc4b48697d8aac039bc8295b48b26df992a7028992a817b0

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