Malicious PDF — malware analysis report

Static analysis result for SHA-256 644d8db679998bbe…

MALICIOUS

PDF

106.4 KB Created: 2021-09-18 11:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 94309a6654b615a189e5ee7c37ff084c SHA-1: 8b0faf59802ea04ed75c3d523df2fcb3a0ea4df6 SHA-256: 644d8db679998bbe54e67e357f67a9e22efb346f01f958715b6da8de2924ad74
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to exploit delivery sites. The presence of multiple external URIs and the link farm heuristic suggest an attempt to obscure the final destination and potentially exploit users through social engineering or drive-by downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://newgrids.com/userfiles/file/48511563732.pdf In PDF document text
    • https://callmarkinvestments.com/callmark/files/22623027133.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210912104511.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/69742608869.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a99db9ed16---8240221379.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/27782550503.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/tugojidufamuzid.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/mepebozofopativu.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/24845872140.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/82480310641.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/nigixejabusalofi.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/20982039671.pdfIn PDF document text
    • https://zzhqhi.com/d/files/56027966592.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/82180449974.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109011136047618.pdfIn PDF document text
    • http://herve-coiffure.ci/files/10427358756.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/bojivusuzux.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403a95d909c---zezivoniwiwumunaxobed.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/54683937058.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/penenibuguvifezewof.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/nugedoga.pdfIn PDF document text
    • http://jljemc.com/upload/files/xafefopefixudulunezaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+walking+dead+sez+3+ep+5PDF 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_off00012f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5F 10860 bytes
SHA-256: 4fb01c2a86d744e007f9191ba67331738a71f0622958bd217baf0409dc919835
font_01_sfnt_off0001484c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1484C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001605e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1605E 22508 bytes
SHA-256: a85379c27da189ebfd357d7ad0138d39edfc57b1f52e414671b10a00cd6e40c4

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