Malicious PDF — malware analysis report

Static analysis result for SHA-256 f966e16c62f51872…

MALICIOUS

PDF

86.0 KB Created: 2021-10-04 17:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1cabddbff2a9494d1b0002978dc1172b SHA-1: 5769a6343f8b36733554485fc41c8707ac5888a1 SHA-256: f966e16c62f5187273b76b0f5ef63ab1a6925fe86f977835c916b9203a3183a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URLs, many pointing to potentially compromised or malicious domains, suggesting an attempt to lure users to external resources. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://meridianchem.com/meridian/ckfinder_userfiles/files/47593294687.pdf In PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/sirinosixa.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/26431848859.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e143421b64---kuwididisi.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/70977328433.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/muzaragiralij.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/48652648194.pdfIn PDF document text
    • https://artbynela.com/uploads/file/96500077249.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/mufetiwal.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/97566908268.pdfIn PDF document text
    • http://miminku2.com/contents/files/pemerurenodatusisowipo.pdfIn PDF document text
    • http://fluorescent-training.com/file/tatubip.pdfIn PDF document text
    • https://funke.be/data/file/5400204807.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/sitorebile.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/38813648769.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/dajevonepavu.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/19193342687.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/fifusodugatipemelazotel.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/pizaxigafudupolopezekuf.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/81071321929.pdfIn PDF document text
    • https://grnca.org/img/files/files/36161113876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=over+fatigue+in+tagalogPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE813 10412 bytes
SHA-256: 5810e776cfc4755a1deda26744fafd30d65b9a5be54f1471ebdbca6ec0634c57
font_01_sfnt_off0000ffd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EA 19728 bytes
SHA-256: a1e73afb357a577b51fae824a596c54add342234d34e614688197252fcc10085

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