Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffaf2dd4c9b32756…

MALICIOUS

PDF

70.2 KB Created: 2021-10-02 14:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6daecd24b573cd22ee1d5a2909b82ea3 SHA-1: 0cc7bf67318e7b43f57e5fc1be30d9ffa9fc3519 SHA-256: ffaf2dd4c9b3275694727cd26c71c94419327ae7bc8f3e2daf48c8b08f51c176
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a large number of external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The embedded JavaScript likely serves to initiate the download or redirection to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=diseases+caused+by+stagnant+water PDF link annotation
    • http://technimexvn.com/images/ckeditor/files/bufolu.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/68367687698.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/24734310755.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/lofuwiremosapi.pdfIn PDF document text
    • https://flomogroup.com/upload/files/58733585858.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/61014971705.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/lawatafowofakavuxos.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/17380680380.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/96038930096.pdfIn PDF document text
    • http://askort.pl/Upload/file/184666226.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/0971744cf3154e2d0f9e9db2274d1aed/25930101971.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/lezuwepogonudafepimuneb.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/14939390306.pdfIn PDF document text
    • http://venkateshservices.com/uploads/kujipetizupew.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/tijosedusogufejamaz.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/gisizakidovekuvolide.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614718d1c95ab---tawegidutovawivev.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/13737120836.pdfIn PDF document text
    • https://wiltech-hk.com/editor_upload/file/83488464391.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/32379848410.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/76377585075.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/fikon.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/97195756020.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_off0000b0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F4 10820 bytes
SHA-256: af85e376dc7859cb75becc558e6a18c966880a0741128a381c90c83edc9ccba0
font_01_sfnt_off0000c9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20D 16120 bytes
SHA-256: f229ab9d41d1597c92c4dfa46a0a91d5e9959ba5a51a4ed5e2de8c594af2c834

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