Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab881c8867d8ab5e…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 09:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 07ab67d3987f9d71b9c6ad521606ef50 SHA-1: 285b6edf41f2a976c97b279ba4b0195ab2b1d313 SHA-256: ab881c8867d8ab5e2216f251e9d3f8fb1ed4477a7ee490089adc0eaef9df4571
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external URIs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://skipjackpoke.com/ckfinder/userfiles/files/15735907961.pdf In PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/58139499806.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/84011988860.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/43932440343.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/wexizevelefex.pdfIn PDF document text
    • https://cedd.saglik-network.org/uploads/file/51947511839.pdfIn PDF document text
    • https://foulardfotografando.it/file/78953256660.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/feninawafefuribijak.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/7316289022.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1632207388.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/zijoxuzorenila.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/0eee8a27500a850d60130927cc4c7d97/kobikabixuxorejeret.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/3mblnapuilmdba2dqsod0johru/596587209.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/zedokiralezokiforodazuxe.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/mifapavexusofazax.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/15171417293.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/13002113213.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/98838990812.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/90508874955.pdfIn PDF document text
    • http://donghotam.com/luutru/files/zaxipen.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/71484931242.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/fidig.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/2476442984.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/okepivurere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=get+mods+apkPDF 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_off0000b05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC874 10344 bytes
SHA-256: 6d1b78ed695a17cbffd82ca3e661f43ec4d818342d348ebb2fdf47ad2f5e0b3b
font_02_sfnt_off0000dfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE6 16848 bytes
SHA-256: 3dcf99b98826e072f951287bddd9b556dfb3dc336e37cc425b48e567c0fd358c