Malicious PDF — malware analysis report

Static analysis result for SHA-256 336191e333ae6ca5…

MALICIOUS

PDF

80.7 KB Created: 2021-02-18 13:48:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ab27e8f1dec59bd1f86bc23d7b675eab SHA-1: 3616f3cb2d3d11dbcf433f8ead436c9e30f65b02 SHA-256: 336191e333ae6ca587ceccfb66710b4c566856c992aa72e769b6306bdac138c9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further payloads or conducting phishing. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving redirection to malicious 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://leonvi.ru/strik?utm_term=presentation+layer+in+osi+model+pdf PDF link annotation
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/mumudedom-tojejeliwuku.pdfIn PDF document text
    • http://hushseo.online/giants_in_the_sky_analysistqjpb.pdfIn PDF document text
    • http://jetaxopavajuluw.22web.org/6380029441.pdfIn PDF document text
    • https://cdn.sqhk.co/lelogusobade/ibpkQhi/power_rangers_super_ninja_steel_evil_tommy.pdfIn PDF document text
    • https://tubidurifubadas.weebly.com/uploads/1/3/4/8/134885002/2065846.pdfIn PDF document text
    • https://lujogisuz.weebly.com/uploads/1/3/4/9/134904514/e3793ff.pdfIn PDF document text
    • http://magnetfix.store/babituwosergfn91.pdfIn PDF document text
    • http://mybestchan.online/508675908744ob42.pdfIn PDF document text
    • https://xupubiwe.weebly.com/uploads/1/3/4/3/134339906/508950.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jokiperone.epizy.com/84200863277.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/taxivififugofuvitajax.pdfIn PDF document text
    • http://dexidije.epizy.com/19441286486.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/belajar_gitar_elektrik.pdfIn PDF document text
    • http://vanakodezifezuv.epizy.com/dubirewefakemi.pdfIn PDF document text
    • http://nirepuxakidogu.rf.gd/english_letters_worksheets_for_kindergarten.pdfIn PDF document text
    • http://tasetexogop.epizy.com/subway_menu_specials_trinidad.pdfIn PDF document text
    • http://jefokid.rf.gd/47272243107.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_off0000fec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC7 5288 bytes
SHA-256: dc288e933192c3c58de32cb0dd69b5be3b250d272ff237126b391e6e9e6eb623
font_01_sfnt_off000110b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B5 11004 bytes
SHA-256: 11e5422311eda01aeadd74e8d308be91497d6a7f5abe2271b23e1286f2f1ed65

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