Malicious PDF — malware analysis report

Static analysis result for SHA-256 426bfe08e519657a…

MALICIOUS

PDF

68.6 KB Created: 2021-09-27 22:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8a9798ba259c3a76f1a0dced76cd9486 SHA-1: 69d2f03c97cbf9eb079812338727f4b49530ef5f SHA-256: 426bfe08e519657a464ec3000fac8d9cded122edfe52acb6cb93be705d765ae8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links pointing to external domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF acts as a link farm on disposable hosting, likely to obscure the true destination or spread malicious links across many domains. No scripts were extracted, but the presence of many external links is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=dragon+legend+tap+battle+apk PDF link annotation
    • http://e-district.org/userfiles/file/24931314922.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161434e0cdfa5e---tutenasanevumujeguvosaw.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/56258612594.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/finezajudulifopiw.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/pukasumikiluwulol.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/54710936296.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/84888588389.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/42835086649.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/raxedewufotamikememu.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/34267587235.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/67323078411.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210903092423.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/36656900636.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/rusavigu.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/bakolugovipowuvu.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/rolubiroduguwowivorojirod.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3431d6cc7---93426639834.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/46131681353.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/fanogefisew.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/kugudipif.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/18832253968.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_off0000af7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7E 15076 bytes
SHA-256: 6c71d16875f46b99c26abac9647ffd89c92c43c267c6618ddbf40b4b3db452e3
font_01_sfnt_off0000d4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED02 10540 bytes
SHA-256: c8cb2341534f907d5823f7b119c9dd53e3edc872ed3445cd333d8e453abcb0a8

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