Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d27f4ffb2564b5a…

MALICIOUS

PDF

90.4 KB Created: 2021-09-19 05:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 06a189f581fbd9988f4bf236e08fbfda SHA-1: 91815892f518ef1422addd4076f0946bc2038284 SHA-256: 6d27f4ffb2564b5ae819a9d66f215c7e65be4ecb9a3f54f9a1fe602fdd680eca
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also hosts a large number of external links, many pointing to unknown or potentially malicious domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/e119b50a6d04230bcd6dba87d3252903/suxevupozapimobilekanar.pdf In PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613298a980f45---43184258004.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/wofamez.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/29030309969.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/74895438816.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/rejukawaxuna.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/56787534096.pdfIn PDF document text
    • https://heyratacademy.ir/file/54670004729.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/zejifiba.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/20822136728.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/jatisodir.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/76537593594.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/ripimukifemi.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/puzopelufon.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/36752892503.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/68172743654.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/81985054795.pdfIn PDF document text
    • https://j26clean.com/upload/files/duwunomafotex.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/noxawiwoxasoxu.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210907090402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+walking+dead+season+3+episode+3PDF 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_off0000fb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6D 10784 bytes
SHA-256: 2fd0b5dd32f3bafe795d442c8290d5387ba7e29f5353e21f979f18e14a6f5c70
font_01_sfnt_off00011410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C22 18564 bytes
SHA-256: acabc673c5246710cf0869e6a865313ef65d34a38be476f0ff7db007bc6361f1

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