Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6fb84ab92f2786…

MALICIOUS

PDF

92.0 KB Created: 2021-10-06 18:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c2cbb5620152847ba7d4bd90a0932742 SHA-1: cd9f2171c6d4340d896ca3471a5f4b0ff4b17a56 SHA-256: 4b6fb84ab92f27864b078918610e35d6c951b8d9ae0fc5f18ba861532e033ac0
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The critical heuristics 'SE_SECRET_RECOVERY_LURE' and 'SE_PASSWORD_ARCHIVE_LURE' strongly indicate a phishing or credential harvesting attempt. The embedded JavaScript likely facilitates the redirection to malicious sites or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://coretry.ru/uplcv?utm_term=send+encrypted+email+outlook PDF link annotation
    • http://ellenia3.eu/userfiles/files/60212674085.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/pirakavejajosidumore.pdfIn PDF document text
    • https://festacontinua.it/public/file/70612758953.pdfIn PDF document text
    • https://khanikango.in/file/liloxilulafipuxufafonib.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/34999721028.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/52325176448.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/xiwegom.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/28822611490.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/dewixob.pdfIn PDF document text
    • https://sistemkabin.com/ckfinder/userfiles/files/83345957446.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/50281760677.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/losufisebuvemi.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20211002234947.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/76851428784.pdfIn PDF document text
    • https://moolans.com/uploads/files/loxukububomemuv.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/2ebc6a9505732eabb517c55280df043a/85406008118.pdfIn PDF document text
    • http://fabtur.ru/upload/files/zaxefekuxuridido.pdfIn PDF document text
    • https://premium-house.uz/images/file/9431682796.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/bajus.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1615a9a0f3382f---gimivenosugekuwajafibim.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/81574208072.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/tijuvikiditoposi.pdfIn PDF document text
    • 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_off0000fef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001170f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170F 10888 bytes
SHA-256: cb868a6ffb1c63d87dbdd8bcb5c14309d4df483492bef6c111c15c82f9c0c49f
font_02_sfnt_off0001303c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303C 19040 bytes
SHA-256: bcffda038c665845ed16774bda41f889db5a1065e2cd7f4b58078a4c84e65c7e