Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f51648ecf7d1d7a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-22 14:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2629565c75177744c1c61dad6ec6db44 SHA-1: ae749d28147e0fbd61fea8bfa74dfa207ed83a63 SHA-256: 3f51648ecf7d1d7af8d0a998e44ee94a441c39e08d489b21ac6c768bcc2ee64b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to a link farm, as evidenced by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous external URLs found, which is a typical phishing or malware distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ambvetfanini.eu/userfiles/files/lerofutivap.pdf In PDF document text
    • http://jolanyee.com/upload/files/202109160517527897.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/dakulafitasorimevozu.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/kepaninib.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/rolovax.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/66547404238.pdfIn PDF document text
    • https://ip-pharma.net/data/files/piwefilepesu.pdfIn PDF document text
    • https://premiersuli.hu/files/files/55240820488.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/83242088913.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/rurawizanakujowonut.pdfIn PDF document text
    • http://honda-vo.com/upload/file/61577396024.pdfIn PDF document text
    • https://datajournonepal.org/files/gexifibovo.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/fewetajofepani.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210909035101.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/i88m3s9duripe2351m66ghphjk/sujipazenifilejiziketuwox.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/laderoraranilasinofixogu.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210910171824.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/bopojotimenup.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/54795198202.pdfIn PDF document text
    • http://wwstationery.com/files/file/90516236310.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/22021843477.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/jejewebiwuloruju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=floating+volume+apkPDF 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_off0000d648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 18480 bytes
SHA-256: e3f17b7cbb9783572dfe486883688e25efda74a26db2758abf67ace6e74375b7
font_02_sfnt_off00011dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFB 10564 bytes
SHA-256: 92066e0841a8aa4e9f7ca8eaebeba6f05e014551841a80f8ff50f77c3e51959d

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