Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5dff9818e00fa68…

MALICIOUS

PDF

73.2 KB Created: 2021-09-22 10:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e41928a487291a77a919aed632daacf2 SHA-1: 8fb6b30dca29a190a74327a3aa5cf37eec328def SHA-256: c5dff9818e00fa6807a15a1ca09896bb5a3660e582a3e497def9870cd12186c1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous external URIs, including one pointing to a raw IP address, indicating a phishing or malicious redirection attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crysiq.ru/uplcv?utm_term=top+movie+sites+to+watch+online PDF link annotation
    • http://rileyillustration.com/images/agency/files/63787869167.pdfIn PDF document text
    • http://szpk.hu/_user/file/jujexidu.pdfIn PDF document text
    • http://apismorava.eu/docs/99955583473.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/27908230924.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/taguvinalivejefurol.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613005a0eaff3---78010491402.pdfIn PDF document text
    • https://bem-sa.com/img/file/rovajozuvifuguni.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/54166960555.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486ea3adcc4---73732079548.pdfPDF link annotation
    • http://avandcie-energy.fr/ckfinder/userfiles/files/fudamapivexoxamitelaji.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/repakajuna.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/26263085588.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210908_210600_194.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/78102603647.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/5452180594.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/banavawatenuzufe.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/97577743235.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/zarufepawebaperufafu.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139270b069de---65809393312.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/56573683108.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/mekozaza.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/53271306422.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/kifemovuzinobabemaxezote.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/maril.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_off0000bda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA4 10652 bytes
SHA-256: 7ca89bc078418b87722762bf6788a45b321fdf53c07e6f0a2203d60db60d972a
font_01_sfnt_off0000d5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 16084 bytes
SHA-256: ceb2af1fa7c7272580180d417d7bed3142a3ae179ccbf0f5a210185b6e33aec3