Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbabd494771d8d33…

MALICIOUS

PDF

73.3 KB Created: 2021-03-08 20:01:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 688b351db853da650a08550d4c381a99 SHA-1: 92bad7c02cd445a13a436dc991c1367b9d8cd0f0 SHA-256: cbabd494771d8d33604914df947d4026ff62f8ed585336f333a3cc06a08a8757
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically identified as a potential lure for phishing or malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is part of a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/award?keyword=applied+naval+architecture+zubaly+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490365/normal_602c68aaaf572.pdfIn PDF document text
    • http://fosukimiten.22web.org/97819364148.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475727/normal_5fcb9ba437f32.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/rebesudanolo/98139851392.pdfIn PDF document text
    • http://furugavasipif.epizy.com/samsung_nx1000_vs_nx2000_vs_nx3000.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/android_studio_build_apk_unsigned.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/rosary_guide_pamphlet.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/44484673889.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/sawezitejazusoxeluzuto.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/tvr_tuscan_buying_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/nexorekuboxafijigiwupusu.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/free_math_worksheets_3rd_grade_word_problems.pdfIn PDF document text
    • http://fomupobidep.epizy.com/luvofukodegila.pdfIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_85e1d22c232c49128f2396136c36fa71.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/mufititikedamewedi.pdfIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_49750acd9124477289dd8b288d5a9101.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitirew/windows_10_build_10240_iso.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/nozuximijujagono.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/war_and_peace_bbc_cast_natasha.pdfIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_73215dcb8a8f43ee8fc8fafd7f05029e.pdf?index=trueIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_3e41c73984fb4f82a9d3949b959e58f5.pdf?index=trueIn 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_off0000e130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE130 5408 bytes
SHA-256: 925d6a2fa1e83feab66ddff563ff7b09830fe895257524ae73e801b5baa4da37
font_01_sfnt_off0000f3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A6 10768 bytes
SHA-256: 29c53e2eb33883ac7ad938e0efcb33b132185900616c927689eeed1ed85e376b

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