Malicious PDF — malware analysis report

Static analysis result for SHA-256 430a766e013ea596…

MALICIOUS

PDF

76.7 KB Created: 2021-09-16 22:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 63b2d5dd8fb44485e51706d50119a77b SHA-1: ee059eebeb5dcec508f7647fb2162b500a3c5346 SHA-256: 430a766e013ea596509897f102c92911481f996407323088f8d8c631af62d25b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting or are part of a link farm, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://florissantdesign.nl/docs/Image/file/70682339090.pdf In PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/gakopogasenunog.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/7809751063.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4f527c2a7---vawuvit.pdfIn PDF document text
    • https://phnews.ro/files/file/44985463391.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/56018784982.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/43318791909.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/68250370473.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/60635076675.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/45924234174.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/71784421165.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/70096459841.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/ritapub.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/neduxorigevodofewis.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/xugibuvodelagijusovi.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/6048633826.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/72007164087.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c337af8a83095c09f74dee86ba0a8a20/dosekulofijanekodavaliw.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/kijitaf.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/89229356963.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/31361340862.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/39472950744.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/goguvededumidizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mario+golf+nintendo+64+romPDF 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_off0000c06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD881 10768 bytes
SHA-256: 6ddefd627d77438384505beda886c6d8f3bb3f3878aaa0d73844cc8876a79275
font_02_sfnt_off0000f11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 19488 bytes
SHA-256: b68ae2b681c0f136eb5d0861c0d5a2b756b404ad6bc9634a595435f7374cef18