Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb4eaa2f94697e7…

MALICIOUS

PDF

68.0 KB Created: 2021-09-27 22:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7e2b87ab87a91d7c63f7a09c0ab489ea SHA-1: 5071f7c713d309a8b5bb7900a04815b13947558c SHA-256: 4cb4eaa2f94697e71921827ff1ca1cab5af83702700f730f4d48f037ad096f27
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many hosted on disposable domains, suggesting a phishing or scam attempt. The 'SE_CALLBACK_LURE' heuristic indicates the document may prompt users to call a number in a deceptive context. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or engage them in a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://garglob.ru/uplcv?utm_term=connect+smartphone+to+pc PDF link annotation
    • http://potlista.com/file/files/35318245540.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/winexigemudatasiginije.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/gulukajis.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/renameruxuke.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/40997750020.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/33799733710.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///95793400320.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/mudalazimukujofukunitapak.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/27497395046.pdfIn PDF document text
    • http://abnicum.ru/files/file/sarekaxipuvutexutisa.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/zujazomosutujakimipaw.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/26981517863.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/vasisijuzofepikame.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/ridoralobum.pdfIn PDF document text
    • http://wedding-ideas.ru/ckfinder/userfiles/files/40244776001.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/duzetulik.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161464546086d0---1957686806.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210913_074915.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/maritabad.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/5261544085.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/zukib.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_off0000ae9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B5 10532 bytes
SHA-256: e5a298551c2805e85ad97bea3065a1b4dc66801d97460b07cb6cd12fe85dcd03
font_02_sfnt_off0000de89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE89 14548 bytes
SHA-256: 79170cc3a0a1583f6f1cae27d823465a27128e260de491e9e071164cadbbbfc0

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