Malicious PDF — malware analysis report

Static analysis result for SHA-256 38dc6d404aa5e1e1…

MALICIOUS

PDF

80.4 KB Created: 2021-09-22 14:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 65f06afecbb958f9a1d0076ab3c2af63 SHA-1: c7b08b6dbe5a620c4a27d2faee55a40ff1e25a13 SHA-256: 38dc6d404aa5e1e1dfcbd1e129c197a963c9afe64a2aa81579805bf2fa2d57a2
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload via the link farm. The presence of embedded JavaScript points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://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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