Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfdbf92c689847ac…

MALICIOUS

PDF

70.3 KB Created: 2021-09-20 23:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2aea798805b6d358b78492a26558f916 SHA-1: a88bc53952c664c39b9a3c9079e211b8103a5bc9 SHA-256: bfdbf92c689847ac5a1989eef19c300997b8f529dc4098d9bb2408c003b56736
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs, with one heuristic identifying it as a link farm on disposable hosting. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to potentially malicious websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://bimbrlata.cz/UserFiles/File/39046025016.pdf In PDF document text
    • http://101eyewear.com/luutru/files/26697520272.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/77948227102.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/jamumusawesov.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/22415031927.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/gibogilozifajum.pdfIn PDF document text
    • http://sparkpro.lv/content/file/kivitowukinuduxixularijub.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/vawonelisisob.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/mafupuginomofunakovefe.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/44300496626.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/moxawejepafonokokatipejij.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/towegirunozave.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/67138498671.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130bfd1b2032---98719453923.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/67938665545.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/xumimopemenuluxiduwifapan.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/10515236037.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/ripubenepizufevufezalulot.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/46362506116.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/malidatawaj.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/tivipezovigogumaxogo.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/30530655363.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/87022358813.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/vijudipabad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pokemon+sword+emulator+androidPDF 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_off0000b249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB249 15704 bytes
SHA-256: c21514218df2db1d3edc8d16b1ab2ffc7451a54a0f6ec65489337f09c96bc7ff
font_01_sfnt_off0000d9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 10688 bytes
SHA-256: fae10e504b572d30be2a402fbf62c4b965773760f7930c3cfcb238f9a4814bf1