Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c77076e2945b61…

MALICIOUS

PDF

81.9 KB Created: 2021-10-10 17:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 67616b1c58e64c84a02513be44284d0a SHA-1: 9776682e32e962bc0f89c08695358f98db43488b SHA-256: f0c77076e2945b61bc129e8cc3b9c76ad8fa711e615f46bf3932f77e14b37b5b
126 Risk Score

Malware Insights

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

The PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to different domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URIs and the link farm structure suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://robwalker.net/fckupload/file/5077211380.pdf In PDF document text
    • http://519pf.com/userfiles/files/kobogomezavuduk.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/sepux.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/lowomasejikozigepale.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/59655256479.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/sekirajarotogawenapi.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/wigupe.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/59588437606.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/28666192714.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/7204e94ba717a730de5c3a0ccb150851/16704092097.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/72254961717.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/winisaxegosujexipetemubu.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/toxuneposenuvimakiz.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/pejeroser.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/64019998057.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/xumanevekebatovub.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/pufareguvopo.pdfIn PDF document text
    • https://mklaassen.nl/images/file/26381426068.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/wigamexiriw.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/bamitoxi.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/8628953315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=private+blood+test+costPDF 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_off0000d9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A4 19108 bytes
SHA-256: f787857ca46bc646ea731242682b2f13f6adb52f30920d8d3b88c9d6c62c5e83
font_01_sfnt_off00010a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12299 10464 bytes
SHA-256: 00b526d168c33a31042c015d2c1947d2047ac9a553d8443233f617c131cc1bc8

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