Malicious PDF — malware analysis report

Static analysis result for SHA-256 24750427f5888e99…

MALICIOUS

PDF

88.0 KB Created: 2021-09-09 17:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 012683a779fc81bda36a5921bf41d459 SHA-1: 4a89ff620a3a117c32ab4acefd3c659f8eb35c02 SHA-256: 24750427f5888e994bc21d9ad4c28d8cd9d7d3508188b7f82e6652c1fd1382c5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, presenting numerous links to external PDF files, likely as a lure for users to download further malicious content. While no scripts were directly extracted, the nature of the link farm and the 'download button' heuristic suggest an attempt to trick users into downloading a payload, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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.
  • 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 http://pillshop.ru/uimg/files/31520235377.pdf In PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/kaser.pdfIn PDF document text
    • https://bataretak.com/img/files/file/jilaborarute.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/7dd6edfe5f39f88400a1e6737d2a98e3/75008029284.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/xorulazanexonatesot.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/jiwutinijeribolebawixe.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/dupejeputuwudibofewaka.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/93429304956.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/terexerudozukolapixuko.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/25205333457.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/jokupewonuwesolatu.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/kasofu.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/87966616235.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/10816268833.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/danume.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/janapukufasipa.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/xodakamimosivij.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/14162239395.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/sobetumofofojegaboxog.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/16223154341.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/fevoxapuzusu.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/zoxefodunusumetoj.pdfIn PDF document text
    • https://penzion-palice.cz/content/dowoxinam.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/xigutufamig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=download+play+store+apk+old+versionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC45 17164 bytes
SHA-256: 5551a51b04cbcd8b59d40736385d1717010ad2a10436d323b28d882cf0707594
font_01_sfnt_off000108e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F8 10744 bytes
SHA-256: d9b1f5b03a8d4757f19dce4e12658ce6df444f7840125074dab8dfde13c100d2
font_03_sfnt_off000139df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DF 16660 bytes
SHA-256: 5bac1e1c1ba23cf3dcc17d3e402cc8386fd4225b69102284014e987a8355d5e8