Malicious PDF — malware analysis report

Static analysis result for SHA-256 98cebe5af3e85a10…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 13:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4bdfc261e9fed0bd77a9a558224562c0 SHA-1: a1f41c602ca2b6e9496f32582d20b1b1f7efbedd SHA-256: 98cebe5af3e85a101f6d94261771a3940ed1719dedd11bffe2574824ff5dafa3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting and acting as link farms, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://chcial.ru/uplcv?utm_term=como+colocar+internet+no+tablet+android PDF link annotation
    • https://gizaviation.com/uploads/files/63630041644.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/95747543122.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/11698104516.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210917_C7D48EF38329F8D7.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/pomuxevowozutanono.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/zodefifegitipipi.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/70948721710.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/voban.pdfIn PDF document text
    • http://myphamasia.net/upload/files/niwope.pdfIn PDF document text
    • http://fructusartis.com/i/File/pupaxuvuvebuxarekuxojeto.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/jopowajixadogubazuj.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/genil.pdfIn PDF document text
    • http://sb-78.ru/files/file/10846230737.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/xejelofenolopelonarudinib.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/degarom.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/gekubotajet.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/votuziluzulebanevuz.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/wumofiwekosezijubopopanu.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/f570387564d7ee08a8eff62c68c93530/mebamimugibena.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/27742180473.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/dofov.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/47563004581.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_off0000e1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CC 17648 bytes
SHA-256: d28a23d6a6af69ad7364ea01c8ce20bec3fedfefc60b1366c1ef35284a565662
font_01_sfnt_off00010f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8C 10532 bytes
SHA-256: 1fa5afb306535b3dca381152226ad3ce8025a140a7e65bd2cd8452c73bb578bb
font_02_sfnt_off0001277d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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