Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a80e2ec3db583bf…

MALICIOUS

PDF

72.5 KB Created: 2021-09-26 10:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5b612d8d5b0f17a2eeda46e00e668fac SHA-1: b85912c626b426c035e297a0eaecd72cbdf17865 SHA-256: 5a80e2ec3db583bfcd0309cada030e4d5b668b3c557e3d6fd5cf258660bd2bb9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of this document being used to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 5

  • 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.
  • 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://interwork.sk/userfiles/file/65014115896.pdf In PDF document text
    • http://gaia-onlus.org/userfiles/file/66172058544.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/nawiwomerebeju.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/67551018105.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fb9df00f9b---konow.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/81456576174.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/37171170071.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109201457025796.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/texukudupepuvasudozux.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/taduxum.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/ditenutobiwefalawutig.pdfIn PDF document text
    • https://kulittelor.com/contents/files/21236947964.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/zunonenorokasefewoxifo.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/pikuvuguka.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/52621363333.pdfIn PDF document text
    • http://annabarons.lv/files/files/55932820000.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/27915753751.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/12371995997.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16146348126382---85126306854.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/gelidowu.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/9148679765.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/76522140001.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/35112207773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=thoptv+v+41+apk+downloadPDF 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_off0000b54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54B 17684 bytes
SHA-256: 838bb006754518dc118a57dfbde11b5e7317c34f0c3c70bdda66d64e8cf7438d
font_01_sfnt_off0000e329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE329 10336 bytes
SHA-256: 93fab913ac833569e7a3cd7307ec9f94e4d1c38dfa28b4c9cdad05904231332e
font_02_sfnt_off0000fa8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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