Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36e8ea1bc08c8e1…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 18:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 04da123cce557aaff8c42e4eb278e87b SHA-1: 10c51e0e629e0a79ff0d6439b0628547b0aa6db6 SHA-256: d36e8ea1bc08c8e1388607898dd12f656b47aa76065883d64ec496ed7adb3917
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely part of a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users by directing them to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/3257319298.pdf In PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161421cac16053---tibewazog.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/55904449115.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/goletilamomukujedet.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/jobuzokifadetimonarolebud.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/6948147734.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/65955888622.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/89910201071.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/zivosubedadogaxogitinek.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/kewatefulidonuninerubo.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/9418133047.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/74667452892.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/57117717471.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109142005066733.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/munetolabavo.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/47281366426.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/45268602720.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/kupumapiterebosulas.pdfIn PDF document text
    • http://esistore.be/userfiles/file/fijukup.pdfIn PDF document text
    • https://invision.buzyhub.com/files/nukakikilumurewevizos.pdfIn PDF document text
    • http://www.bash.cl/media/file/wakamajexu.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/77561980357.pdfIn PDF document text
    • http://ymmicro.com/files/files/zupigowosunilafaj.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/28388546103.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/54253719865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=can+you+cast+your+phone+to+firestickPDF 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_off0000d9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F8 18192 bytes
SHA-256: 369a1ee9213cf394af98dfb6b66b9c439babc3ff60f8766892fb54b8323e50c0
font_01_sfnt_off00010951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10951 10868 bytes
SHA-256: 6300a8082357292757c7b58dab82316fd6d9e846e2ef7f46342f49d0abcde3d2
font_02_sfnt_off0001227f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1