Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d6fa6befc4b89e…

MALICIOUS

PDF

69.1 KB Created: 2021-10-02 17:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 812674dd35c247cf254ef047ddd3e3f6 SHA-1: 8e22ad4e30ae840905aaf3cfd54626e7877adc0b SHA-256: 58d6fa6befc4b89e7ebf149d77af97c3a2763aa7e792954d3a656fadaabd3042
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files, suggesting a link farm or a distribution mechanism for further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent related to SEO manipulation or hosting of malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://tranduongauto.com/app/webroot/files/images/pages/files/tapepopegowudivef.pdf In PDF document text
    • https://homestayhoian.vn/uploads/image/files/wubupipilipefisek.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/gaxavepofidokixosaka.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/bifan.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/joligurenitapiz.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/xoguwewufup.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/kenidijuvuginedurufabi.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/57489936816.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/jazorubadomuz.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/78016608012.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/92609663736.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/18472869561.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/21772968388.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/xidoxafedixiberinin.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/redeg.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/vesezuraroxajapi.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/b76c891bc9ece78a44bb283040ffc362/73923686736.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/48106090903.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/57372406123.pdfIn PDF document text
    • http://vaynhe.com/upload/files/japunobegokefaga.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/77170686223.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/70125248740.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/wirerurego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=logo+answers+for+logo+quizPDF 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_off0000ae90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE90 15780 bytes
SHA-256: a74bf44a0be4dbb97d42f6f3ff32940e2d27ad71157901cb454fdb8df85f4d8c
font_01_sfnt_off0000d697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAE 10640 bytes
SHA-256: 69479178e455f25115247eb36554f365a57c4217912cc5f75d9d862364c57e60