Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc556ae257762f7…

MALICIOUS

PDF

74.9 KB Created: 2021-09-16 04:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 708f4f7973f1d99711d9f69813b1a1e6 SHA-1: e37e96efeea77c300eeff7a5dd0317ec1452192b SHA-256: 0bc556ae257762f76053d1def6e2d9c8d898bfeadda859fadfb92357c9f2d44b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to disposable domains, a characteristic of link farms used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, likely leveraging techniques associated with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://drafthe.ru/uplcv?utm_term=como+usar+o+youwave+android PDF link annotation
    • http://uptindia.com/newsimages/file///60665272711.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/20617416178.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/80302913814.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/diwal.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/luxawexabofibufaxiw.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/23953750950.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/ninenajanopuxef.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/2820275355.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/999e052b60c481c81ca3f0a4699ecc54/99623613799.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/poxokaviwalixafa.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/wusenaki.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/zajenamugepupo.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/82518952117.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/zarebaxalurugegi.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/vitagobugojo.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/lewogo.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109042136077373.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613880484aa76---novezimaxipofesabosi.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/tavepewesukufinan.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/62182619710.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/13267550007.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/sigusilobivavaxaxuwonelef.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/leribenodurobogeka.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/60837180051.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_off0000bdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC7 18340 bytes
SHA-256: 95cd7a6c535f42214aa0aa08aa491b5e90a6f2f5d8c8d9febe23d79d0c8705c6
font_01_sfnt_off0000ed27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED27 10664 bytes
SHA-256: 78a0e11c9caecfdd02383472f4d9358b78f67a22ffa4c86086068ee1ced07414
font_02_sfnt_off000105a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1