Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c495f345df553d2…

MALICIOUS

PDF

77.8 KB Created: 2021-03-18 23:31:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: b9623000923f950a824cb3e4759138c3 SHA-1: 6c196ecf5c29fe12855001caab7503704d83fe71 SHA-256: 5c495f345df553d2ad59cfb253add264c3f9dbb620b1c42332250863232ef0a6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful content.

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://resalured.ru/wix?keyword=precision+teaching+curriculum PDF link annotation
    • http://copyrightreports.com/best_tactical_knife_under_5044iqe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470412/normal_5fcfa55e37364.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/yds_e_anlam_sorular.pdfIn PDF document text
    • https://nosevale.weebly.com/uploads/1/3/2/6/132683459/gujajaruluxumaniwul.pdfIn PDF document text
    • http://modezewop.mygamesonline.org/google_search_engine_optimization_starter_guide.pdfIn PDF document text
    • https://derugipuze.weebly.com/uploads/1/3/0/8/130814861/keguvokojukelakatasu.pdfIn PDF document text
    • https://danifiwap.weebly.com/uploads/1/3/4/5/134585556/241533.pdfIn PDF document text
    • http://fullstacket.online/21505734668orwzl.pdfIn PDF document text
    • https://jamiwimavebu.weebly.com/uploads/1/3/1/4/131453695/goretagug-bovubule-mafelijo.pdfIn PDF document text
    • http://zukoretevir.medianewsonline.com/bible_tagalog.pdfIn PDF document text
    • http://supernefritroller.xyz/cdcr_visiting_form_for_minors6ybg1.pdfIn PDF document text
    • https://mogasijukunuv.weebly.com/uploads/1/3/4/0/134042787/6795701.pdfIn PDF document text
    • http://xiruzox.mygamesonline.org/61173238047.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385847/normal_5ff26d00958b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bdabe90-143d-4a60-a160-f19355c7aa9d/the_royal_ranger_book_2_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61b31c68-a1eb-49bf-ab16-b8b913c176be/70531303745.pdfIn PDF document text
    • http://rukosivujuxu.atwebpages.com/46073402799.pdfIn PDF document text
    • http://lupixopuvir.onlinewebshop.net/dictionnaire_franais.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/134fb3cf-97f6-4caf-b098-3132befc4c1c/xugifiwukuxusenepivofiru.pdfIn PDF document text
    • http://sawurawefivovo.myartsonline.com/agatha_christie_movies_online_youtube.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_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 5216 bytes
SHA-256: 806a8c194a190906a32008734c837d9e093de8db717d0f4f13ef65d82f67cfef
font_01_sfnt_off00010255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10255 11916 bytes
SHA-256: 1f2808844b73fcf8574ecebf8855890fa378019941a3fc281be07253c0dea1f3

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