Malicious PDF — malware analysis report

Static analysis result for SHA-256 51debe0f1b8a6d7b…

MALICIOUS

PDF

79.1 KB Created: 2021-03-28 05:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5419dc9271a51dbd987e6b1011365f67 SHA-1: 013613f8ce227e8b59f4cafdfe861e856cf725da SHA-256: 51debe0f1b8a6d7b22623c2dd28b19fa8a8bba3423eb0935a860a09750d5b4f1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as Pdf.Phishing.Trojan. The presence of numerous external URIs, many hosted on disposable domains, indicates a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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/123?utm_term=java+ee+7+tutorial+source+code PDF link annotation
    • http://mumolazesinidix.getenjoyment.net/28581035461.pdfIn PDF document text
    • https://xalifabosivibu.weebly.com/uploads/1/3/0/7/130775217/8008224.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388839/normal_5ff4c43b50d3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387061/normal_604a1bb6b9d04.pdfIn PDF document text
    • https://vagewojevibo.weebly.com/uploads/1/3/4/8/134873572/kobamiwox-raribu-ximuxononavaz-sopujidegose.pdfIn PDF document text
    • http://jojazinex.mygamesonline.org/todigiwejuwevisawefekujef.pdfIn PDF document text
    • https://nixejinalir.weebly.com/uploads/1/3/4/3/134321479/kuwanonepuno_luzufewuj.pdfIn PDF document text
    • http://tulavesew.getenjoyment.net/doduxozuxafibusokovunatak.pdfIn PDF document text
    • https://xaweworamek.weebly.com/uploads/1/3/4/6/134610398/nepudoxos.pdfIn PDF document text
    • http://davebamonuzove.medianewsonline.com/edit_text_online.pdfIn PDF document text
    • http://gamowenugeg.sportsontheweb.net/water_analysis_lab_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408463/normal_60436ac7db399.pdfIn PDF document text
    • http://pokovata.scienceontheweb.net/ruxokesiruzamoxulasiju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375195/normal_603b14314ef96.pdfIn PDF document text
    • https://wotewaga.weebly.com/uploads/1/3/4/6/134615540/zuxonobavawa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruboxoziwoz.rf.gd/cinema_4d_trial.pdfIn PDF document text
    • http://wegamaluperetuj.atwebpages.com/13396246412.pdfIn PDF document text
    • http://gexovudin.rf.gd/balumaluzuxolaneve.pdfIn PDF document text
    • http://tibamupebunod.atwebpages.com/amana_front_load_washer_nfw7200tw_not_draining.pdfIn PDF document text
    • http://mizetum.onlinewebshop.net/brukner_and_khan_clinical_sports_medicine_5th_edition_download.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_off0000f43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43E 5064 bytes
SHA-256: 3d9d20cd1bf5ca9da07cded57e5f3a28514f66f7dc121ff6e8495d7aa0bd75be
font_01_sfnt_off00010593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10593 12940 bytes
SHA-256: 6836e998ce0f34bbb47777126b804f899bc8ce32ceb7e71587fbe6a634768039

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