Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad3bf17d914766b…

MALICIOUS

PDF

80.2 KB Created: 2021-09-10 13:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 616c00d5c299757939bc4697e8ef1fbd SHA-1: 173578eb34663e5bcbb00af21b016e7d6703311d SHA-256: 4ad3bf17d914766b361f6db5883247e106d077b5503c8507e2a24ac6e919811d
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to an IP address. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to a phishing or malware-hosting site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=snack+video+how+to+earn+money PDF link annotation
    • http://leylasuren.com/images/userfiles/imagefile/busosaxetesozoxavis.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fe2db43ad---nosewalijufakoberebe.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/93661285030.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/39614740239.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/zonewalibajijixerewabove.pdfIn PDF document text
    • http://gekon.net/userfiles/file/tokedevifanoxal.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/69974158727.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/filerugowomiridegemetemu.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/fotidifurobixebu.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/pagoforubisitowedebexar.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/58985773042.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/75682422371.pdfPDF link annotation
    • http://lnianemarzenie.pl/userfiles/file/guwuribigevipi.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210908070717.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/72048450403.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/53805598045.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/57598848420.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/73098941848.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e70f3b7e4---51215914892.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/69801289610.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/72786107563.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_off0000d4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DD 10856 bytes
SHA-256: d2db9ebdfb6f3d6adc9fe156099e7fe0ae317c7b589afc844e44e18a8e024038
font_01_sfnt_off0000ede2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F4 17508 bytes
SHA-256: 8ece017c48ecd68afd9e7697b3e015aeca38aeea17e884bdfe4ce70f5e7b59b5