Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4c51c5db56250d…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 15:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f68e18d86e8bf0e17a7737002f50a7bc SHA-1: 41d674938afc59724facab99ec0e21cb4f41b5d2 SHA-256: 3c4c51c5db56250d586d0a5d36cf55644b25e3523f748d7bc30e7689c1428391
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which are likely disposable. The embedded URLs and the PDF's structure strongly suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://cc-loges.com/uploads/file/84765006488.pdf In PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/64078458386.pdfIn PDF document text
    • http://hanifeugur.com/image/files/36055051828.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/12752245814.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/79720060637.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/jitexibedogelusewe.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/18539025055.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/86801157173.pdfIn PDF document text
    • https://digireg.ru/upload/2617461076.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/84237380344.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/zexevawiwolikawotavazi.pdfIn PDF document text
    • http://nova-auto.com/upload/92451746163.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/2944381211.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/64483345698.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/kenewawopu.pdfIn PDF document text
    • http://contextuae.com/resimler/files/19071509336.pdfIn PDF document text
    • https://cncunse.com/d/files/dizitosurafifaburudiruzuw.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8c5dca27b---verumugiwome.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/valipatuveduragijawolosad.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/jetus.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/noxadanozig.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/82764761743.pdfIn PDF document text
    • http://beijingteye.com/upload/files/wivofizesebo.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/7dd8ddf5a7b46a325e74419726a4e1a6/91688229327.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/kojigasoj.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/nirabezerivojinivile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=o365+mail+server+addressPDF 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_off0000d813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD813 10652 bytes
SHA-256: e34d2019e986d005aed780c8d52dbe5e9e22530b41c9d49fb5c5f19b62bea973
font_01_sfnt_off0000f08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 17324 bytes
SHA-256: c06b9fc5accf47e876f21a281063eafd7e1afbd4f9c79b801388a5cd8078450b
font_02_sfnt_off00011d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1