Malicious PDF — malware analysis report

Static analysis result for SHA-256 9efcf9978dd3eed7…

MALICIOUS

PDF

74.0 KB Created: 2021-09-20 02:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 718215eaa8d80dc08a0c3e26e0b432c9 SHA-1: 74f95806291d5f4fe4d5a1903ca126d21d1a73de SHA-256: 9efcf9978dd3eed75810e0f32f613cfe9e22b76610eb3067b595507be3eb8859
146 Risk Score

Malware Insights

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

The PDF file contains multiple heuristics indicating it is a link farm designed to direct users to external, potentially malicious, content. Specifically, a URI points to a raw IP address, and another heuristic identifies it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • 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 http://runbo.net/upfiles/files/16309655344308.pdf In PDF document text
    • http://ff-engineering.com/userfiles/files/nezifoputu.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8494c8cf1---70445485884.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/pebimekelogasedi.pdfIn PDF document text
    • http://sieuthibds.net/images/files/62501132719.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/42923007187.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/11297682437.pdfIn PDF document text
    • http://dongphat.net/upload/files/22598763984.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/16563696250.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/pakox.pdfIn PDF document text
    • http://belniig.by/public/file/rusububukodufigoroxud.pdfIn PDF document text
    • http://robbes.nl/media/files/56166391007.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161407fcf103ef---kegejomu.pdfPDF link annotation
    • http://twilaw.com/files/files/gamunogironimutoxefa.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/90377724606.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/1129413340.pdfIn PDF document text
    • http://vucert.vn/uploads/files/35864929145.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/53083858916.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/45269890921.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/93716031640.pdfIn PDF document text
    • https://securitydm.com/slicice/file/50271403167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=no+1+game+of+indiaPDF link annotation
    • 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_off0000c06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06B 16796 bytes
SHA-256: ac91c477b5962e0e916fc1efcf26ba809119966bde096c68c4053c55919e656d
font_01_sfnt_off0000ebdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDD 10312 bytes
SHA-256: a6aaa1f628a63750abd038b833e608899a6b1569d0f9d57e4b6805995c839f3c
font_02_sfnt_off000102e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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