Malicious PDF — malware analysis report

Static analysis result for SHA-256 3561e4960625bf6f…

MALICIOUS

PDF

86.5 KB Created: 2021-09-18 11:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ca9fb7ce3bbdee3d2cfd8c6f33ce36be SHA-1: 501dc1e3c459185a2d71bb9b559dda05464403c1 SHA-256: 3561e4960625bf6f1a9a1d5e4de015dff9e278d66932f9fada30cea0ba5acb43
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or scam lure. While no scripts were extracted, the overall structure and heuristic firings point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://djk-winkel.de/images/uploads/file/11762482345.pdf In PDF document text
    • http://ayrh.internet-match.com/upload/files/vetuligabofadakerezanotil.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/34662219402.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109040429055187.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/mitivimidafole.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131587685709---xarukatuzatosogofag.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/13968020506.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/xadapiwanul.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/fejobijikupabulugif.pdfIn PDF document text
    • http://clingac.com/d/files/lamunenakanaminedapigul.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/vivam.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/21280012349.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/zutafiven.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/pamowonepave.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/4763492560.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/14132349908.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/zenurogewuto.pdfIn PDF document text
    • https://aspart.ro/ckfinder/userfiles/files/73576104646.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/69084330779.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/30583400793.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/gikodekepojivepoju.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/93025783165.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/lumijupalamewa.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/motududofeporazoripe.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613423165a866---tatadiniz.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/60906931150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=navigation+drawer+designPDF 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_off0000f023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 10504 bytes
SHA-256: 381ce40edbe46f019c5ff0ef3e55c1b98ed25839d9d39068023ed3d3c8d478ef
font_01_sfnt_off0001080c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001201e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201E 17432 bytes
SHA-256: 495c2ef39fde42165b1b06cc3a2ac12dd7ba19357f4920e4c59ca42756e1c7b6