Malicious PDF — malware analysis report

Static analysis result for SHA-256 5942e10fbec7d081…

MALICIOUS

PDF

81.9 KB Created: 2021-09-11 19:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 7e44499769b2e5b14472cd2adcbbd1fb SHA-1: 2b6fb6d4a98cf88529e7d6159e37e7395b9c7045 SHA-256: 5942e10fbec7d081218a0a82d6bdbcce8b8db5cedc793cb420c152e7e6c12462
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to distribute malicious links. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ketchas.ru/uplcv?utm_term=how+to+set+up+voicemail+on+samsung+android+phone PDF link annotation
    • https://www.stock2morrow.com/ckfinder/userfiles/files/vubajujoda.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/tuwokosukov.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/jufajaboxuke.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/63844228761.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/zozipobaxizuxigefebini.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/61521180946.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/91606113130.pdfIn PDF document text
    • http://gibisch.info/files/files/555741556.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/tebusexijufepemojol.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/55170034551.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/80561104759.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210909013509.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/59978513902.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/derezate.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/zarofunozibuga.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/wudomufolonogojotowid.pdfIn PDF document text
    • http://mebco.ru/images/file/mefokufubamiganimikasidaf.pdfIn PDF document text
    • http://headrepublic.pl/images/files/72805689771.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/73062375559.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/51057493107.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///xiruf.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/38915133253.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_off0000d793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 11204 bytes
SHA-256: af39d45fdeee0bdea7ab3fef77b92b7de465595296af02f25a8d699a2e916b79
font_02_sfnt_off00010980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10980 18552 bytes
SHA-256: c4eeb67a5058a0c295b011880f6b316050db3e66114aeb9b882986dfc84aa86f

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