Malicious PDF — malware analysis report

Static analysis result for SHA-256 768b59bf5ed221e9…

MALICIOUS

PDF

84.8 KB Created: 2021-09-24 00:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3a22a8c1f59450214fb447f7650bb014 SHA-1: 6371b67660236fef3ee2b634bdd5d89a17b5b153 SHA-256: 768b59bf5ed221e9e821dfeff8f75ba83f08a3132bb24e1bd5ae1de5c6dd904d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document flagged as malicious by ClamAV and an ML classifier. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing a browser extension or update. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it may leverage JavaScript for malicious actions, potentially leading to further exploitation or payload delivery. The document body was unreadable, preventing a more specific analysis of the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://pearproperties.in/userfiles/file/remijopumojalodemedovasik.pdf In PDF document text
    • http://naim.naparts.com/images/fck/file/navokuferasazixenu.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/46087938664.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/wezegigozodusabigatoguv.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/99389944597.pdfIn PDF document text
    • https://www.suep.gr/ckfinder/userfiles/files/govomuvifiviwosavofimivi.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/99464902985.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/4983341336.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/35681494121.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/d1604243319c30da6063ecf48d8c024d/64009843201.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/pexarinutej.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161476bd76abfc---57178200977.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/ratizawejixugiwumeziwav.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/xorixonemuwasupame.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/kifijudexamupivef.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/12128731639.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/pojinobikuwago.pdfIn PDF document text
    • https://vleek.com/uploads/files/pipajivoropumaf.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/tewilotajosopiremima.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210911173646.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/85144994549.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/munoxufatemopudibapazifaz.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/vezotorofumesesidizemev.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/24574611775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+take+a+screenshot+with+android+11PDF 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_off0000e324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE324 19136 bytes
SHA-256: 1ca84a5ab8a3f9cd1643275747f16bf805244b8b706170bd2c58bac67698e441
font_01_sfnt_off000114b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B7 10640 bytes
SHA-256: 199cdedd3664ff163741e2372d3b0a542466b4bcb6c828db2de6e3a54312debd
font_02_sfnt_off00012d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1