Malicious PDF — malware analysis report

Static analysis result for SHA-256 c677150f224f48cf…

MALICIOUS

PDF

73.5 KB Created: 2021-09-10 18:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: baca38688564b9b963826d6e375981ad SHA-1: 88031c8fc08759b0a758758ce54f6bbd7e9cc4e4 SHA-256: c677150f224f48cff379365c03770982cafadeb4caf8acb67ddbc028533c3d5c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

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 https://drlanda.hu/user/file/34943644624.pdf In PDF document text
    • https://shunnasato.com/24531388687.pdfIn PDF document text
    • http://lovesenergy.nl/file/relexewobejibevigugofigu.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/68544140630.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/lojixetokemupasapuzever.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/52796142397.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/96208172083.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee525da826---degubu.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/7000112775.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/viwufawosib.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/raduvuxiwovukaxowozo.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/21912037416.pdfIn PDF document text
    • https://profm.hu/files/file/subibizofiko.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/wajivujalado.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/4299611128.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/74551776557.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/ridalifarerizasu.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353d035edaf---fakuwaj.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/51152880379.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/81576582442.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16308610982405.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/99221717065.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/bimimuvupemubesiwesitis.pdfIn PDF document text
    • http://didopack.com/files/17223650773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=difference+of+prime+and+composite+numbersPDF 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_off0000bbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD8 10976 bytes
SHA-256: b6e86b5130fc2b20ac35e28dcb53b9402ecd492f6756618a0610b1d0b9978d24
font_01_sfnt_off0000d51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2F 16604 bytes
SHA-256: dd751b12f2c356dfcccb0571d18f0988f57a18928e7dbd965ad864c072c00aea