Malicious PDF — malware analysis report

Static analysis result for SHA-256 59e28a1b1372bd58…

MALICIOUS

PDF

72.6 KB Created: 2021-10-03 09:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5b846e070bf03a1a76a827ae69799226 SHA-1: c70b831e298d728ab2a2153d637948ba8bbc9025 SHA-256: 59e28a1b1372bd58402914f309ff20aa8703b04dd098b27753fcd6fd5f813a0f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, characteristic of a link farm designed to distribute malicious content or phish users. Heuristics indicate it's a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious. The primary attack pattern involves directing users to external sites, likely as a precursor to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=can+you+refreeze+vegetarian+food PDF link annotation
    • https://agrilaui.com/userfiles/file/76090332129.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/30627940676.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1632133163ZJqw.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/73195780625.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/72231482427.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/32262954781.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/ponutamivi.pdfIn PDF document text
    • http://fivelscope.net/fckimages/botuzufepuxaf.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/posexo.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/fufavidokadabapipigarijen.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/39324314786.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/wivej.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/92722908062.pdfIn PDF document text
    • http://amigo-shop.105h.net/upload/files/xubisomifu.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/rigikawalefakut.pdfIn PDF document text
    • http://teifsepahan.com/files/file/19263338597.pdfIn PDF document text
    • https://sardiniagreencoast.com/userfiles/file/17163724925.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/vewigejupobonar.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/42624014956.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/74672712751.pdfIn PDF document text
    • http://regmac.net/userfiles/files/severumikawigij.pdfIn PDF document text
    • http://industrialdevices.in/uploads/polojagafibemareketebetat.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362ca17a30f---dutadi.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/70547040309.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/49828125031.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://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_off0000b72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72D 17512 bytes
SHA-256: 9133a5c6b024e19b730b8443e6ddd8bf1d71c09ecba3d20e7aa6c26d0f9ed0f6
font_01_sfnt_off0000e3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 10684 bytes
SHA-256: 400c2ed57dad917794b1f6b88f8a63a813cc73ad79511802317ccc26aa802223