Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d916cf311e04de…

MALICIOUS

PDF

81.2 KB Created: 2021-09-11 10:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2285b5c721ece8d0cb0eceed55e579bf SHA-1: dca6da65b072ee11e7b00e471912b686d5eef6c4 SHA-256: c6d916cf311e04deb3f7056b3cdb4788b70ed10c88cfdafa7c26c2c096ebcfa2
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URIs, including one pointing to a raw IP address, and is described as a link farm on disposable hosting. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates an attempt to redirect users to potentially harmful external sites.

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://top1np.com/ckfinder/userfiles/files/lanitozonekim.pdf In PDF document text
    • http://rosabaum.de/web/editor/files/49345255207.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/zeder.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/99962609767.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/mirojosimopamovizafuxe.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/duwesejoguxozodorugotub.pdfIn PDF document text
    • http://art-ball.net/files/file/marifanumuxezivawe.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210904_120243.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/26917046101.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109031256228237478pejkg.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630780615.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/85391882329.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/wudukevozezeraf.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/fozekomixizogamusem.pdfPDF link annotation
    • https://rlmahtani.com/userfiles/files/nutojitikoluketepapuva.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/litipumit.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613be1817de10---76067779163.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/71241029017.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/bipevesobipuvuvikepip.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/59317302139.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/063698c0008d6d71c8a338eb5f101062/benatukirazidebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=rocket+league+download+on+androidPDF 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_off0000d729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 10700 bytes
SHA-256: a223e2594615b8ab487610f9238e6372014b78000c47394a2133606f9977e8ca
font_02_sfnt_off000107c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C8 18300 bytes
SHA-256: 95bbc51237f103d103c1da195223eb8f43b7dff0d42354793e2f6e29be3a681d

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