Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9ae0e59c37d7ca…

MALICIOUS

PDF

75.7 KB Created: 2021-10-03 21:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 815401294c96e27a6208f414a0d24478 SHA-1: 6676b112b204b9a480155d2d8a7e17b15ad122f0 SHA-256: 5d9ae0e59c37d7ca3fec992a07cc8823fdff536a6801ef97ee9e68132eeccbac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Heuristics indicate it functions as a link farm on disposable hosting, with numerous embedded URLs pointing to PDF files. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the use of many distinct hosts and UTM parameters, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://cvsc.co/userfiles/file/38257879167.pdf In PDF document text
    • https://udruga-invalida.hr/files/31941579306.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/63414437824.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/1122922430.pdfIn PDF document text
    • http://sapthagireesyathra.com/userfiles/file/85819293899.pdfIn PDF document text
    • https://expomediainc.com/upload/file/xopadototamawujofegum.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/21083203906.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152031348a04---wizotaviwepivuwo.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3484228615.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/53880700257.pdfIn PDF document text
    • https://bacsionline.net/userfiles/file/petijekakixuzowiw.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/misamorinawego.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/lagutewoforejewobobini.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/losejonovixitebewonukazi.pdfIn PDF document text
    • https://yilmazlift.com/userfiles/file/jateguvexenorobebev.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/95160371218.pdfIn PDF document text
    • https://truongdongkinh.phapluatvietnam.com/upload/ckupload/files/22625031435.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/wologi.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/90084596454.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/23260060172.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/17022088924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=political+science+book+review+examplesPDF 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_off0000b963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD175 19948 bytes
SHA-256: 9c3253d57d55faf41f8dc0b3a6629cc9e848c3b7c10db653b35c91be449dd239
font_02_sfnt_off0001061e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061E 11024 bytes
SHA-256: 91e2a6e2feab43c4ee40962bb18d0e460b1895bb1ce69e44d7a1e8e45b8354d2

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