Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa5df8e511c4c22…

MALICIOUS

PDF

71.0 KB Created: 2021-09-28 22:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b24e3759eaabdf0983bdea7ba252ca9 SHA-1: 6f65a2948a3a8a4f45a485983e16e70edc8c1b01 SHA-256: 1fa5df8e511c4c22c4bb82c9a0261de50ca7e79cb4cf9a82855c494236c0b7ad
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2d7eb495c---vogirulimobusipiwovoni.pdf In PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/vogixamenifotumezediki.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/fiwuveruto.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/15974131046.pdfIn PDF document text
    • http://greenld.com/userfiles/91978016501.pdfIn PDF document text
    • http://erictex.com/ufiles/files/87341873289.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/13877422491.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3a1ddf7b4---zotubesixo.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/83455924842.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/jepizemafegibikusiwikuso.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/96596742973.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/pulinewemomepel.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/wigijutirotoxa.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/lunodakababovemura.pdfIn PDF document text
    • http://domario.ru/userfiles/file/88633338684.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/73800766492.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/dezoxujesenivewudozizitu.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/61312525882.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/10435459814.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/23590966377.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/11080591207.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/65132187155.pdfIn PDF document text
    • https://deepex.hu/hirek/files/47163637058.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/vediwojiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=nuzlocke+pokemon+romPDF 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_off0000b05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05D 17936 bytes
SHA-256: 06defdd1a5a943281304a0f2119563f5dab55b768caf8e3763ccfcc5d7e90cce
font_01_sfnt_off0000ddf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF4 10244 bytes
SHA-256: a0e6f1ff22d8208ddae349a88735450cb3db6f0c707cffab42904d03b69ce1a6
font_02_sfnt_off0000f4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1