Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0cef5e8a291c4d7…

MALICIOUS

PDF

100.4 KB Created: 2021-09-17 06:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 63049c0c487ba278c1e97072540c532f SHA-1: eda4805935599afb1b3f413b269fa3bd4cca889b SHA-256: f0cef5e8a291c4d767feff7ef732ef157db3a289544b57bc89d244a62d7c25f5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URLs, many of which are part of a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature of the file, likely involving exploitation of PDF vulnerabilities to execute a payload, potentially via embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=neo+geo+metal+slug+rom PDF link annotation
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/70541333285.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/32183340489.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/nopove.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/jolizubusoluvoforu.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/36602774552.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/d864bd3165b767c448d3da0544410d79/jabolunejevizupijoma.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/miwij.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/81463498634.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/60469361394.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/fedibebofapajedi.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/zewakipekadesixilos.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/wafuwawiguvorejiji.pdfIn PDF document text
    • https://datenglagi.com/contents/files/64063960575.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/8485911721.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/10019721940.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/1817219067.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/zesamevebulawa.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/93546671972.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/5015583592f4a5a006b72ad4e453b9ff/fejojuwetew.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/33989323762.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57610835220.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_off00012772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12772 10332 bytes
SHA-256: 6015330f72427e613b2ce85c8e8f54aba78af4585c2ec6bc3cd7c5c141e7a485
font_01_sfnt_off00013edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000156f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156F1 17412 bytes
SHA-256: 703d11830dc5b895c226cbd147bd0ced5ceba4a2e18c9a7c7b97eba449920569

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