Malicious PDF — malware analysis report

Static analysis result for SHA-256 b960540b0f414860…

MALICIOUS

PDF

73.4 KB Created: 2021-09-24 18:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 837b4e45ec233387be96442fa057237d SHA-1: 53e5ef51850fb938e2da247cef27e2b31faa1cbf SHA-256: b960540b0f414860671003d445fdb4cc2fa6683e9b9bd916762862fad948002e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the embedded links lead to a collection of disposable domains, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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://alariel.be/userfiles/file/28402310801.pdf In PDF document text
    • http://imosa.asia/uploads/files/202109020731333552.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/wonezaredofedipewimud.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/68322068511.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/95033417719.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/tavukijakukuxid.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/xavijud.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d385688b17---funogakifetukati.pdfIn PDF document text
    • http://sieuthibds.net/images/files/91791516014.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/dabozikekogevofeluzonovex.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/73271810450.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/54473391634.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/84796748532.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/44593420811.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/3052088938.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/loxub.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/fawurikik.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/88493462825.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/kuvoge.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/6aa013101b193d3f862e83330b67f77e/64259611953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+sea+rover%27s+practicePDF 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_off0000b875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB875 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD087 18644 bytes
SHA-256: 8d6ff5905b1fd643ef45334c522e792126dd6d832b0fcead044815ae4c2393d1
font_02_sfnt_off0001013c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013C 10384 bytes
SHA-256: 444488e81c3e6a36e95692d96ef0a0d321fc0f1fa8ac975302622addffd263e3

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