Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d673a5162fa3be…

MALICIOUS

PDF

74.2 KB Created: 2021-09-17 15:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8260a514ba9d712bc8fe868608ca4bde SHA-1: a12c37f4ff39d30c2aae2c9c4b30b3f6916c0a73 SHA-256: b1d673a5162fa3beef83afa4e3caddc7fc1cdd7011fef6916e03636ca3a44a74
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

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://nomylo.ru/uplcv?utm_term=world+cricket+champion+apk+download PDF link annotation
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140c5cad5961---fisoj.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-5/20210905134822266818.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/1065003169.pdfIn PDF document text
    • http://eichler-kammerer.de/59385759016.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/96403591661.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/gojimupi.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/96646501795.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/75850080463.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/1667035882.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/17726144091.pdfIn PDF document text
    • https://bachson.net/upload/file/1499182450.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/sedojukadowigifevupupesin.pdfIn PDF document text
    • http://insei.eu/userfiles/files/fetudubaje.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/92d8402861de7aea7df7234554443867/14915489997.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/rikaziv.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/21744766795.pdfIn PDF document text
    • http://weingut-suppan.at/files/rumipitefixipuxeviva.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/zafezeredaxuji.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/rugofoferalonebuz.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/zizimagum.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/fevazitarazododerasol.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/fimox.pdfIn PDF document text
    • http://vhz.cz/user-files/tutoragusopezederu.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_off0000beb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C7 16912 bytes
SHA-256: be35426290cc3836fe2f44aae50680232bec009c5187e823771688c36a53a71a
font_02_sfnt_off000102bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BB 10784 bytes
SHA-256: 33faead1d69d6e4fe56829ce8f2dc7addbe6783e0602c552bcb8142132827791