Malicious PDF — malware analysis report

Static analysis result for SHA-256 5337fa533ee6136d…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 12:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c2f745e492b7bf3a086d430983ba8707 SHA-1: 6f904644caed694cac40974deba9fd7deb203f4e SHA-256: 5337fa533ee6136dbce577e09941911f658dfac2008480f176d7ca6820f621fe
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The presence of a 'download button' heuristic further suggests a lure to trick users into downloading malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=how+to+download+mp4+on+android PDF link annotation
    • http://pcccmiennam.com/media/ftp/file/36353601430.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/welafuros.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/37817832182.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/wutirevaji.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/pirujujojubixurar.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613021e74617d---71688591214.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/sawirelatusarufurogig.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/14373824462.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/17138325762.pdfIn PDF document text
    • http://boki.hu/editor_up/25818251572.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/lumorigejakebononubekolut.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/82731711116.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/jezafosefaviviluwopiw.pdfIn PDF document text
    • https://vestol.bg/files/file/zatabinipunigilufibufuwo.pdfIn PDF document text
    • http://soc-in.com/data/media/files/mudogabigitibepizidobeli.pdfIn PDF document text
    • https://2acontractor.it/images/file/71822009407.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/45133233861.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/dupojomedorumixa.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/zisiwozuvigateve.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109032257515627.pdfIn PDF document text
    • http://cocoal.com/uploads/file/zupagavawimelos.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/82507491106.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/pogawunesugotu.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_off0000da71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA71 20004 bytes
SHA-256: 5a16b0f16c91e0e04ee5986a9836868bd75a03fbae59c0a775664b8835ad7168
font_01_sfnt_off00010f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AD 10408 bytes
SHA-256: 85990e8f740c8804bcfd19d4282fe1aa0cedfeaea3963c1317a8b73c419039a1