Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b280e130fa34aa…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 17:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1c3f7076d5a00f217e12b40fa1d10b06 SHA-1: 476fc2497087cd5ca609613533dab896f0f5f81c SHA-256: f2b280e130fa34aaeb2bbd3553e2d93f178c30b9557b9c58e6611581d9ee212c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous distinct hosts, suggesting an attempt to distribute malicious links or host phishing content. Although no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs point towards an attack pattern involving directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://bepxuyenviet.com/upload/files/65693092701.pdf In PDF document text
    • http://z-sinpro.com/upload/files/15971363377.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/44873127151.pdfIn PDF document text
    • http://goldmustang.com/files/files/98131764170.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1632559803.pdfIn PDF document text
    • http://ned.ru/uploads/files/8010887068.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/66342710a9ffeb41f36014ae7412c447/lataxisuk.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/52507990048.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/sovetajuzamotiverivena.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/u67etlvpu3f8h9dmlcfmc97h2r/garegiwefixupiluvin.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/22120056727.pdfIn PDF document text
    • http://ssp.by/var/upload/30354582625.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/gufovevofuzuxesedo.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/27957669003.pdfIn PDF document text
    • https://birotex.rs/images/files/zodibafebidoludopebiv.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/37004382999.pdfIn PDF document text
    • http://mariancozma.com/_user/file/vudekuxebokeresiwinuse.pdfIn PDF document text
    • http://sksound.com/userfiles/file/fesule.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210905_CD86A3BC16CFF763.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/zevotemofi.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/ditezino.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/tijuvurexizo.pdfIn PDF document text
    • https://parkettworld.com/upload/files/64194086933.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/pezizobokiluwinabewagav.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/26450895130.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161345f0c72091---gedovujuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=monitor+network+with+raspberry+piPDF 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_off0000b27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27C 10728 bytes
SHA-256: 14ed50393c810f396f613fe79da6721a823701e56e083c3fa3fc0787e19345e7
font_01_sfnt_off0000caf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE305 16188 bytes
SHA-256: 643fb34909d0f1655c7f1da2df5824695d458a138438f9f4eba9878ddc9f5451