Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8cc06d935d6f3d…

MALICIOUS

PDF

95.8 KB Created: 2021-09-20 06:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c1bb3a1459c9e19cec003cc7d9e06687 SHA-1: 25b5a2cba1d6a54dd0ddecee4f9307e15b281d06 SHA-256: 4f8cc06d935d6f3d654b57e40871f9ab559166390e093c6414fae27d354b6692
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, suggesting a phishing or scam lure. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=free+instagram+followers+trial+2018 PDF link annotation
    • http://servicedental.it/userfiles/files/710824098.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/17311235530.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/38420973673.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/4790011008.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/kojipomijetoferuxu.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6c125450e---malekobesulobadoneguv.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/vupebuxefikiriv.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/wesuzusorelixokamejuwive.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/9296846251.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/ralamipixakefujepifofiki.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/66754367926.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/radorifikanoju.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/11398210377.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/34783995480.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/38916309839.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/nezotus.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/tajuf.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/laxizumofumodonalodudu.pdfIn PDF document text
    • http://usagimatur.com/files/others/wobuxepupikowutiru.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cbc92ce27981144c6e1ab95eddcee92d/56938225753.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/80828667036.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/46245408110.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/nilazukakiwogewew.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_off00010f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9F 11124 bytes
SHA-256: 89afaf1a014b45603b6fad15372353ae03fb4f8a3156a30d1c0a9626d2f2999e
font_01_sfnt_off000129b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B9 18416 bytes
SHA-256: ddf4e9119cf52fc59766831a2b373d413f006000a2f4845816e761975e01f1b3
font_02_sfnt_off0001599f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1599F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1