Malicious PDF — malware analysis report

Static analysis result for SHA-256 91208cfb0e14a8cb…

MALICIOUS

PDF

83.5 KB Created: 2021-03-25 04:11:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ee09069db1bd802ad76b5038ab34f8c9 SHA-1: 30502b758ee8f859ef4e1af356f32f57dc5c7a73 SHA-256: 91208cfb0e14a8cb99875908e89831d172687f36c5e88fde27b921a52037acc9
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'crophysi.ru'. The ML classifier also strongly flagged this PDF as malicious. Although no scripts were extracted, the embedded URL and the nature of the heuristic suggest a phishing attempt to redirect users to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/wix?keyword=the+flash+games+for+free In PDF document text
    • https://cdn.sqhk.co/jolodovi/vghjhgf/kagoxarovidariri.pdfIn PDF document text
    • https://cdn.sqhk.co/firataxoworo/i5gepig/jazozonuroxuxepisukabopev.pdfIn PDF document text
    • http://kilijosizujowo.medianewsonline.com/iskender_pala_su_kasidesi.pdfIn PDF document text
    • https://cdn.sqhk.co/fokofike/jjjghji/just_already_ever_never_yet_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/xajezijanu/QrjcWjg/19454792460.pdfIn PDF document text
    • http://purunuza.iblogger.org/87212349979.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/jihhjj4/74311153786.pdfIn PDF document text
    • http://butalinonoruma.scienceontheweb.net/poisonwood_bible_online.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/kigavanus/zusakulelojenup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6785c64-8aea-452c-b4ac-590ccfb1e6c0/wix_change_email_address.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/52429779628.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7f86fa4-a27c-43fb-80e8-eae1b466915f/reaccion_quimica_de_combustion_formula.pdfIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_654daa1af1e541e2822e1f369a338f2b.pdf?index=trueIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_46bb36f59c0e4742ae914ad34c3137e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/61450776068.pdfIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_358f3afaacfd4134a1ce74d6155b0d15.pdf?index=trueIn PDF document text
    • http://vidojizo.rf.gd/pafusekunosiratoji.pdfIn PDF document text
    • http://xerozodofuvu.epizy.com/2066691785.pdfIn PDF document text
    • http://zelalosiker.rf.gd/parts_of_belt_conveyor_system.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/xetuxalomuwasuze.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/cuales_son_los_titulos_de_credito_al_portador.pdfIn PDF document text
    • http://gilebufamefaf.rf.gd/does_microsoft_word_have_flowcharts.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_off00010aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA2 5132 bytes
SHA-256: dbba5aaecf45ea888db97a5404bc075c44440b6541903ddcf6e9035d8e491116
font_01_sfnt_off00011bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BED 10352 bytes
SHA-256: 342efafe0236fb812cd813b149c00cca7f823a6459da247e0da266a5bb415fb2

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