Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf0bb3ebe0b46c2…

MALICIOUS

PDF

70.1 KB Created: 2021-10-01 14:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 876b48703389dd99f05ee612e667a1ce SHA-1: a52f888d7f8102bbf25084e56964cb313d26ff62 SHA-256: 3bf0bb3ebe0b46c2403c638c78260c7f24cd389370a214d26b122ffc691698d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a common PDF-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

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://thekkadyinfo.com/userfiles/file/wazebofewizamupexogazesek.pdf In PDF document text
    • https://mokhalasati.com/userfiles/files/14093705149.pdfIn PDF document text
    • https://arendic.cl/files/pisekosazugurosuz.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/13158397436.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/zuvoxixu.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/91086592009.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/39773595766.pdfIn PDF document text
    • https://mollis.rs/files/85640339261.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/33079094475.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/83187809402.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/ligikasuzavuxek.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/72351142780.pdfIn PDF document text
    • http://sooclose.eu/upload/File/muzadefevov.pdfIn PDF document text
    • http://kotrackusa.com/fckedit_file/file///20210910_15_3_9.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/saponav.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/retoterakipera.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/89536280914.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/kemajoxerozaxiw.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/8668565287.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210921_171350.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/94455753215.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/53826943512.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/vugofojofaj.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/97683796154.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/jedujeravajadujot.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/tuter.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=stream+a+bug%27s+lifePDF 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_off0000b163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97A 10684 bytes
SHA-256: b6c931ee0ad17492d9f0857f20c097758d511b59903b05a50e11b5df4cf169df
font_02_sfnt_off0000e205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE205 16208 bytes
SHA-256: b1b8ea7eaf29ac4b74bff88d8c0231fe5c575d2df7ccd8de5efdb3204c19a07d

Open this report in the interactive analyzer, or submit your own file for analysis.