Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1eb097775794aaf…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 14:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 17ce299c091b59dab5d8852e5d9f92b0 SHA-1: e61075362ae325be4e40eaaa2b343f46d362776f SHA-256: e1eb097775794aafd15e437858d2c3d81d800d79f58dfe00cf06ea48d232a0cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=android+emulator+showing+black+screen PDF link annotation
    • https://alihuata.com/userfiles/file/lexolafu.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/tasafulodiwuvazimedena.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/leduxunaloxexigizozibol.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/20041953676.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/guxezijuwoxevagumu.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/devawajuxigen.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/pumepu.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/bujejilipomedu.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/45330636941.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/nabiferibiga.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/zaxipilenudiluvimurenod.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/disoguwalunujobavisixaxok.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/48698039294.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/bozubo.pdfIn PDF document text
    • https://petek.biz/resimler/files/79952654916.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/21245412830.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/9603551541.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/26575630761.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/tiwugozurapebetakuko.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/junixikitigukopuxutelix.pdfIn PDF document text
    • http://bndweb.nl/upload/files/10354844807.pdfIn PDF document text
    • http://abc-tel.ru/data/File/moxuzal.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/8c1fd1b49c5634e9cfc0bce93b005600/9139001846.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161391da59738d---21306904383.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_off0000deef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF701 17568 bytes
SHA-256: 0b2ff533c19c100ab88736e03e4430ccb54fb2b109dbe699f7cf037f4d2cd010
font_02_sfnt_off000124ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BA 11216 bytes
SHA-256: 4c3c2addb5aa7e0f92137f7c75044f73db6f0af2d749d96c594ce71c2847f30c