Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57311eb5dad84ee…

MALICIOUS

PDF

70.6 KB Created: 2021-10-01 21:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 98546ad7d8763be84d5091fa5917debf SHA-1: 5862099ead0f0b4d5bef848a95cba088c172f547 SHA-256: d57311eb5dad84eebde50b9d08401b02ba7aa81aec2f0170ed9299713f840a42
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. This script likely redirects the user to external URLs, as indicated by the PDF_URI and EMBEDDED_URL heuristics. The presence of numerous links and disposable hosting suggests a phishing or link-farming operation designed to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://przedszkolenisko.pl/userfiles/file/kelozexojimozejalokivewa.pdf In PDF document text
    • http://siripanyalamphun.com/user_img/files/53281521277.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/80850618271.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/89687274435.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/jifewemu.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a190a7ac89---migib.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/31778962787.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/dafomavevod.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/22240407862.pdfIn PDF document text
    • http://duef.ru/public/file/61385802772.pdfIn PDF document text
    • http://fastbeatbattlerider.saint-fun.com/assets/upload/files/duwakisadiropepiwikopoda.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b52b3ae52f---28663953204.pdfIn PDF document text
    • https://ebmcordelles.progess.com/userfiles/file/fusiwimugogawakavufuzepir.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/4441103315.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dolopaxipal.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/letutozesipo.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/78213173033.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/62333197318.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/64089949843.pdfIn PDF document text
    • https://fptica.ru/images/file/vaxorenezizagube.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/muvesagagu.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/72964626865.pdfIn PDF document text
    • http://clingac.es/d/files/65909529364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=lesbian+granny+hdPDF 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_off0000af5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC771 17540 bytes
SHA-256: b690009a8b45db9415e5ac2da4e049d7f412900ceafbc184ada6988ae50b00eb
font_02_sfnt_off0000f40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40E 10476 bytes
SHA-256: 8c34e465378fdb9df7786a984b2f62aedf0600c56955f5348a9b7c76daa11ea6

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