Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf8cbc1aa418509…

MALICIOUS

PDF

79.2 KB Created: 2021-09-16 02:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 077cd246764730ef654200e63b68665e SHA-1: 66438698d41f8a16f6f476db59b026d84d242673 SHA-256: 4cf8cbc1aa4185091fa39b071f645a716d4ca91b4e6afc143a19299c2003e9c6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The presence of numerous external URIs, including a link farm heuristic, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=pdf+file+convert+to+excel PDF link annotation
    • http://wjcopy.com/upload/files/74679751226.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/50216712663.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/24708927273.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/getoveg.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16134f05aa9bbd---jupadixixezejosemuro.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/14856426795.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/fafovupenoxutokav.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/kigobilupe.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/80321844229.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/dubimupizimaguzuze.pdfIn PDF document text
    • https://tpk-m.ru/files/file/fitimojivuzewuji.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/48219059624.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/dakuga.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/volezekiji.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/lemiporizir.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210910201653.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/82646592391.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f10bb98477---feketivugor.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/dujavaxosapitawodesep.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/85696686100.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/6082613186.pdfIn PDF document text
    • http://regcureguide.com/files/files/88693075279.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_off0000d2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DB 10308 bytes
SHA-256: eb982ff91f02b72e85eeaec75c9618d6cee8a9c11d88cf15beb3567739226a39
font_01_sfnt_off0000ea2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10240 17688 bytes
SHA-256: 86d626b2edb05f7826cea22d42927deb2c50bac2c7485347d53cfad9ccce16c0

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