Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0d852fcbbc8a7f3…

MALICIOUS

PDF

72.7 KB Created: 2021-09-14 03:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ce8b3c1c17019f3df5e13983b0fb770a SHA-1: 931088214befdd1f34acc79ac689755dd01b8247 SHA-256: e0d852fcbbc8a7f39dc5d3190dc32a3487f2381332e78819ec2975c820505e54
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing attempt. It contains a large number of embedded links, many pointing to disposable domains, designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a link farm used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://houstoncoinshow.org/FCKeditor/file/77526665200.pdf In PDF document text
    • http://zaiger.ru/img/file/23203292804.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/46658330734.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/49373548192.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/moxiwa.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/61635034536.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/22566129487.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/xepowawadimumilisinogufig.pdfIn PDF document text
    • https://digireg.si/upload/51521960605.pdfIn PDF document text
    • https://bor-diing.com/upload/files/jatelolefof.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/67395862986.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/22280909954.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/liwadozuxetavepepiweku.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/fidisezilimozid.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/diwojafozi.pdfIn PDF document text
    • https://slide-bearing.com/d/files/92178636372.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613515718b400---88353847788.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/49178275656.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/vetisogebagimas.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/31253814762.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/45594492491.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/ranikinu.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/51038820119.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/demigo.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/fibum.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/1f3e039187a672eff6f160f7af22c5ae/vafalefuralazirejumuz.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/22937914910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=22g+cloud+gaming+apkPDF 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_off0000b728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB728 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3F 10572 bytes
SHA-256: 60c6698ebba508cdd5fdef13ae47c8e97d58536040d642a3e3978a92fb85aa8e
font_02_sfnt_off0000e71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71E 17804 bytes
SHA-256: a066cab3d6476236f67250ad57d8d1e2bd9a7390e57adca1f326d36b63e5130b