Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ebb9211652560ca…

MALICIOUS

PDF

78.1 KB Created: 2021-09-17 00:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 001ec23166b3aae7bab865d7d75f6b04 SHA-1: 4b165f833955d42e9881c7c97b218874c78fe037 SHA-256: 3ebb9211652560ca3862e9e0b14698cbc2b04a23953c531b3bb95f738821bdd8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous external links, many pointing to disposable domains, suggests a link farm designed to redirect users to potentially malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://rcmo.ru/upload/files/90168687249.pdf In PDF document text
    • http://nenkin-t.com/upload_img/ck/files/mozazemutupoxiviwobeboji.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/faraxirira.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/13830456982.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/99938673233.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/xeposi.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/35654984234.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/pavenegoj.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/36163133125.pdfIn PDF document text
    • http://maksimetall.ru/files/27434684148.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/34790348780.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/43709409847.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/buwajilev.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210909120900.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/noperufetuvebovuwabof.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/nafiz.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/87993167812.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/tiwijijizujofukemaberop.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/ef407c7c81ddbf776cecef6a701207ae/duruz.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/zixuzasuvarafoza.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/xupekodosopesejobaxe.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c31eb06a8---4857804921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=smiley+face+copy+and+paste+fortnitePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE99 10972 bytes
SHA-256: a153bbf12fa41acfc91e39dd67f02859c38dbe54f0b28773e25e0973e107f9c1
font_01_sfnt_off0000d800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD800 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0000dff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF8 19788 bytes
SHA-256: 03c27b5c1e372ffb0afa9a6c61b337e80b4a5fcdcace37e138e46d6a1f037134
font_03_sfnt_off00011216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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