Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53ac4214b497fbd…

MALICIOUS

PDF

78.5 KB Created: 2021-09-18 23:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9c0db8277842761748d351e88c400352 SHA-1: d4275c1593b9074890555bdb17d67cd1d1812631 SHA-256: c53ac4214b497fbd08ba1d181b971f118e930f24fd3141828cab4bcd2058ce4d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farm characteristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=where+to+enter+iphone+code+on+android PDF link annotation
    • http://www.hangmandigital.com/files/file/tumete.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/malakazuzosejusitat.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/98029767822.pdfIn PDF document text
    • https://equimat-cheval.fr/file/4065910712.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/kewot.pdfIn PDF document text
    • https://tuinvandecruys.be/file/28651118765.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/68976340896.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/vunovavuzaderoxugelefek.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9f0fc0434---bavowiloparovut.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/77552474357.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/81720297738.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/xawasudumadakagopupivale.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/majidadegelaperunukuw.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/purewimesijuxediper.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/32178443149.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/75479465116.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/pamowonepave.pdfIn PDF document text
    • http://alkanboya.com/files/file///25045024482.pdfIn PDF document text
    • https://granitnet.hu/editor_up/15107955146.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109140151393084.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/61065446216.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0202223eb---88045617331.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/57799395267.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/86454156165.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/29188218042.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_off0000cef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF1 10392 bytes
SHA-256: 20008150b550c3890bcc60ee44ddfbf0492633890fe78830b61f9fe08bd1eb16
font_01_sfnt_off0000e665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE665 17396 bytes
SHA-256: 10e7ab895a4d02c5ae0a172bea56f940f84c3c299c370f0a087a5f53709c873d
font_02_sfnt_off000113a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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