Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb96fefa6bc43e23…

MALICIOUS

PDF

74.1 KB Created: 2021-09-16 23:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a4eed2bf007e30ddc0ebfa3751fb49e SHA-1: 6b2c6c51e8af4cadcbecbf92f6cacddc06163ce3 SHA-256: fb96fefa6bc43e230e24231cf5f61c21fc0eeec5026744d7a048ff8175e43136
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 employing UTM parameters, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://irlanc.ru/uplcv?utm_term=hot+wheels+android PDF link annotation
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/luwirenorupide.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/kejafoniranijapawapov.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/35754946448.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/xofugujaxadozobipumuzawa.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/sowejinodazes.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f214d22455---90923579923.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/lavajopuzu.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b3d4e3b27---lisekegunilidegomes.pdfIn PDF document text
    • https://umartravel.com/files/33157293740.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/bazaxapibemusaduduzaka.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/sowujenujubevegero.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/24339871302.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/65799124274.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/90457523578.pdfIn PDF document text
    • http://turnyras.lt/Files/file/dirakile.pdfIn PDF document text
    • https://temahr.hr/files/jolebotalumobagisem.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/marina.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/zomemudovugalok.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/rosiwofamefesalanafoluv.pdfIn PDF document text
    • http://vswet.ru/f/75373034474.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/gebizetufuwotamuxodemafi.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/danemotej.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/lisakidogorafipez.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_off0000b931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB931 10420 bytes
SHA-256: e3271eb02ad8dba268e0931d7ba239139f36be2062d75d92603fc4e62623d37b
font_01_sfnt_off0000d0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DC 19352 bytes
SHA-256: a8bebe49b9e5a1377cfb21fac5ddbe2b99cb95401b88a7acf30a523b21b52a40

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