Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea14f36e4c19b400…

MALICIOUS

PDF

89.6 KB Created: 2021-09-17 19:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 226a6d63e874c19de5395a3c2cad44a5 SHA-1: ac1e7c47e2e62bd06c1a488c701d8413fdf205d9 SHA-256: ea14f36e4c19b400a8cf54f5143a16a5ae289d0d04f400debdd77b6e4f16287b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, with many distinct hosts and UTM parameters used in the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=watch+online+movie+hollywood PDF link annotation
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/d75d7d634c2e40eb8e988742b5f88beb/kimujozerefobabisewas.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/gazoxitobitijabelidebite.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/vejapig.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/49490921197.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/sinugewaponefavajiporo.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/78183217897.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/xefawotenavevebifowowe.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/mobezit.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/potumoxamipelilo.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/jovusukemovekemupov.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/vipebamewosomuj.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/wepir.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/sexovaxarivepawikagerebos.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/17237551636.pdfIn PDF document text
    • http://secoinblock.com/upload/files/rozasaf.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/34111987875.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/ropokupovuteb.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/xujugodemuxixirix.pdfIn PDF document text
    • http://elitacasa.it/images/file/bejabe.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/54574165412.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/95690899162.pdfIn PDF document text
    • https://svilia.restavracia02.com/userfiles/file/wujilem.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109172050214122.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/tnov15edggrpn04qh7kfdjdvrc/25641073574.pdfIn PDF document text
    • http://knipia.com/userfiles/file/39653806131.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_off0000fb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2E 17520 bytes
SHA-256: f71381d1669be7c5e002024a3c618ade2f6e24c28ae4efe77fddcf2ce132513f
font_01_sfnt_off0001283f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14056 10624 bytes
SHA-256: 2937184c4bfbfdd043fb37ea0de89efc8e891a87712f0d8f74db227c8e45343a

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