Malicious PDF — malware analysis report

Static analysis result for SHA-256 da95f1636f669bc0…

MALICIOUS

PDF

73.4 KB Created: 2021-02-21 12:27:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 208116f9ac29b08c5fdeae14b1df9524 SHA-1: 8ddaaefd584b8319702a941626737d644d19b08f SHA-256: da95f1636f669bc0ac5a32a98969e56170f6a3eee5a4ab9e522026216676c5d2
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The document employs a social engineering lure, specifically a 'Browser extension / update installation lure', suggesting it directs users to install something harmful. It also contains a large number of external links, indicative of a link farm, with one prominent URL pointing to a potential phishing or malware distribution site. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it is designed to exploit user trust and lead them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • 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://druttle.ru/strik?utm_term=how+do+i+sync+my+logitech+m325+mouse PDF link annotation
    • https://cdn.sqhk.co/venitalobeni/ehcbgeh/86155741999.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484156/normal_602d7050678e8.pdfIn PDF document text
    • https://nilesezijifata.weebly.com/uploads/1/3/4/8/134885493/goporukudasut-denib-jivujafuk-pazomudelalibop.pdfIn PDF document text
    • https://gibiboxovozigux.weebly.com/uploads/1/3/4/7/134722082/48d0b3568f5e3a3.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/9ggjhhd/toon_blast_candy_crush.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460460/normal_5fdf59f47adea.pdfIn PDF document text
    • https://cdn.sqhk.co/josedinis/M8Jghih/dungeon_age_of_heroes.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/finilufiwafol-basogag-tuvenagexuteji.pdfIn PDF document text
    • https://cdn.sqhk.co/rorezina/hdghbjc/vuzudamezoginusojigov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/bosoki.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/corrugated_metal_roofing_sheets_home_depot.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/nipijoxeloloxu.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/verabajimut.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAB 5624 bytes
SHA-256: 324a1f72188bdd8334f297f3ad002b3d8645ec800e66ea1a497340eda8ca9a3a
font_01_sfnt_off0000f0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C3 11220 bytes
SHA-256: 26f40532b6c37af814b12bf53a03debbf96d75e21fcd57eeaeae64fa127ca6e8

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