Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09fe89a90a5ccf9…

MALICIOUS

PDF

75.3 KB Created: 2021-10-02 17:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e0a65149dcc1cc670aa81eb6de1ab50d SHA-1: 36dc20099cd7b1e34f848e3aaf6260c0612724ec SHA-256: b09fe89a90a5ccf9fed0ad42c956328f289fff940fa9770facf4c3f284ab12ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or host a large number of lures. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://surausa.com/uploads/files/73897193464.pdf In PDF document text
    • http://fundacionecla.org/resources/original/file/92576639112.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/42831232683.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/834734894.pdfIn PDF document text
    • https://casaalu.com/luutru/files/xudevep.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/vusumodewejugivi.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/kefuloridozasi.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/90859905704.pdfIn PDF document text
    • http://allasclub.com/campannas/file/gegodutusenipi.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/puvovoxedemem.pdfIn PDF document text
    • https://dm288.com/slicice/file/vutim.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/fajuverupelozuzixiporit.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/32578114949.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/94716330936.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/tufidugazuzijoranur.pdfIn PDF document text
    • http://afro-safari.com/upload/files/327597297.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/diwixamexofazitedatif.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/loxademudoni.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/64292724438.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021092511493019.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/81390049526.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/df6cc32d5438290b55ea19cb28cd6133/96866214128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=adjective+starting+with+e+to+describe+a+personPDF 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_off0000c0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D3 17508 bytes
SHA-256: c20e9be9c69c5c4d7a5df22701446d6d3b9299d41aa097641710641c0d3f6211
font_01_sfnt_off0000edf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF9 11152 bytes
SHA-256: 2764badb4241b7d29a4b4e088ce2d3659f0ce4606f8b0f3755953265b5856bad
font_02_sfnt_off00010794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10794 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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