Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c386575610042b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-23 23:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 76a134bc95a3052ce03eb74c46930e1f SHA-1: 19f4b7fec8eba9fa9f1733ab0d21662ab81cafd3 SHA-256: 88c386575610042bca8ae7347025bd38dfc964e5dbfb44899a9b46b529b56ec5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one specifically identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://xn--interpeas-r6a.es/upload/files/jinokipor.pdf In PDF document text
    • http://globalbando.com/DATA/upload/files/202109162301542697.pdfIn PDF document text
    • https://lapakunited.com/contents/files/runarovi.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/filege.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/38772693404.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/10040596311.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/zapisosolurigagofojorijuz.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/58301698112.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/xekesegusaw.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/60045207753.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/7769658063.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/10520412438.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/44975699399.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/pisufuvisekozi.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/nalava.pdfIn PDF document text
    • http://jiab.net/userData/board/file/80082238024.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/520651b3c2231f82e57bfff7c2d21a03/gokirejemogo.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/pubadutadam.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/n859gqbqe2acgjera57lguv4l1/48104428636.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/vupeguwifokoginututagan.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/61772466259.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/3853872516.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/73983103967.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/83441754937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+most+cheapest+phone+in+nigeriaPDF link annotation
    • https://lapdonline.org/file/42695402162.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_off0000d712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD712 10740 bytes
SHA-256: f0358be1e60668d69ba9cc86282e1668a3f818aaa8bea08f860f3816fca4e6ed
font_01_sfnt_off0000ef9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 18588 bytes
SHA-256: 6e134fe7c7f4fa25b7338cca8a61960f20fef654dea66d28414cb48883033617
font_02_sfnt_off00012024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1