Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73ab333a70c1b5a…

MALICIOUS

PDF

83.6 KB Created: 2021-09-09 08:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 030ff2daa0a16a4b0f454a447b851efb SHA-1: f07d7513ef6d3d7ccc82ed4d74e3deefcc1367f4 SHA-256: b73ab333a70c1b5a1165f5871387a169104ef3c5cf48135387f95a1cd618892c
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://davobio.com/upload/files/83639690248.pdf In PDF document text
    • http://elazentrale.de/images/uploaded/file/82140052269.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/jesewijasuzolef.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec683e9f93---17344685101.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210909135757.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/12202145679.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/89039077655.pdfIn PDF document text
    • http://kbfrutos.sk/images/_file/74559986033.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/tonemumakavumejipifalusek.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/boxonurodeki.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/jatenubuner.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/34009382489.pdfIn PDF document text
    • http://greenld.com/userfiles/rudenowobamixotoluzetori.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/46013597417.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/senorejusezata.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210908_81F217E167E1585C.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202195112216079.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/bogamiwerusitutirefekup.pdfIn PDF document text
    • https://kristinanamaste.eu/files/fezavowonaxudiruwetetudiw.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/goritugix.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/wasudapuwe.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/tunelesagofixajuveb.pdfIn PDF document text
    • http://byecook.com/ckupload/files/62644699381.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/fenenopupenizokunifisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+unzip+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_off0000e419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE419 17828 bytes
SHA-256: 5e40588f3f4c42fbb50ea064acdf74af514c867ee2eab39300ef3e88b6034a08
font_01_sfnt_off00011216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11216 10128 bytes
SHA-256: 088f13f2fc1c43859f49299d0ea1beca7a480b4625b80d7cce919c068eb4a373
font_02_sfnt_off000128d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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