Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a3b9df2ddd7034…

MALICIOUS

PDF

79.0 KB Created: 2021-09-18 07:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b49371012b5b2809e9f02b4f15edfc3d SHA-1: 3f8e988af3fcd04065276a6a30d465c9586b6402 SHA-256: 02a3b9df2ddd703414d56c8f416b40fb3edbbb3da7ca41a5a978c9f97a4e5ae8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a phishing or link farm operation. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags the sample as a link farm on disposable hosting, reinforcing the phishing lure hypothesis. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://wastran.ru/uplcv?utm_term=android+11+samsung+apk PDF link annotation
    • http://boonfagrandhome.com/user_img/files/97861007348.pdfIn PDF document text
    • https://topupdana.com/contents/files/83851818023.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/42165111255.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/kufera.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/firipiwerepakenofipo.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/95443212721.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/wamekefab.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f4221a9a0---nasuzibesimededorutadi.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/54743316545.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/larizivilefunaporesupu.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/63367241242.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/pewenugiwoxukelajefi.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/11697274692.pdfIn PDF document text
    • http://yuli-china.ru/d/files/finawepak.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/15994276991.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/20365065866.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/14767329639.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/losuwofotazutepel.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/8672472573.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/pulanarinowegasusor.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/43307626593.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/worifogixe.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/938afb753ddddb1cd98effce66beed9d/59421075375.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_off0000d252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA69 10684 bytes
SHA-256: dd9867d9dac96ad830ca8bc4068f9d6c975ab4a5d7062dbd71d03fb0297a9aa5
font_02_sfnt_off000102b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B6 17136 bytes
SHA-256: c1086ca47c1f68c14ee6fe7b4e3e1700bc47ad88ccaae8d66672b7dca41ae9ea