Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c115b9229d138d3…

MALICIOUS

PDF

84.6 KB Created: 2021-09-09 01:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3f0124a144f5a93231c4d60ef66031a3 SHA-1: 65ad416b444a54f295b18c481ccc0d06be8c7957 SHA-256: 9c115b9229d138d33e5bf318ae585079c5dac997c8625e5363e9270b71186de1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, some pointing to suspicious domains and one identified as a link farm, suggests a phishing or malware distribution scheme. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick users into downloading a payload.

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.
  • 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://topclassgreenery.nl/images/file/68941664401.pdf In PDF document text
    • http://avtokit116.ru/!upload/files/liwafegagikarakulipufudik.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/xinolasutuw.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/60998596718.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/tudoxur.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/sadite.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/5376441334.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/27876269598.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/87839004544.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/66745209551.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/23406814551.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109021210476802.pdfIn PDF document text
    • http://specimport.by/files/files/40751773554.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/bepowip.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/29004329534.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/dofuvodanekenibifubufak.pdfIn PDF document text
    • http://hzqzg.com/d/files/wejixotuwukagamikobuwasow.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/43096264445.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/86132939747.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/a41240046c64c727c3918e635a4ee898/musuwi.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/xikuzotepulemivunor.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630549099.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134cf93903b1---nepirejorigudowizetazor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=chakravyuh+full+movie+movierulzPDF 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_off0000de77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE77 20696 bytes
SHA-256: 5f6ce82a74b6a5bf5658522adb9e2e76b2af7ef32c1d2703aa3d2e64de1137e9
font_01_sfnt_off000114e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E5 10572 bytes
SHA-256: b3d5cf573616a013a41b62572f6e28d916f4656f754b560e35309c5c134d1836
font_02_sfnt_off00012d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1