Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5975f09689762af…

MALICIOUS

PDF

87.7 KB Created: 2021-10-04 14:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4cd5cd033dd227cfc4ca3074e158d855 SHA-1: cbeb387d158930efbd911407c18fc1f3568caaf8 SHA-256: b5975f09689762aff3f00eb4c5f3d52687c14df612fe30c88205c1792487c59f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also exhibits characteristics of a link farm, with numerous distinct hosts and a high number of links per host, suggesting an attempt to obscure the final destination or distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://altronic.pl/!mag2011/userfiles/file/95680766081.pdf In PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/82237815113.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/96225274485.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/dikupobemorumazujulefol.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/xozezelosovanokavitaxi.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/75890243785.pdfIn PDF document text
    • http://test-immo.com/file/bagevom.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/lolasofizubularuzijuxepif.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/gibag.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/zumavala.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/sozowipu.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/samikogoro.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/koxenepixito.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/74307968043.pdfIn PDF document text
    • http://bulmarconsult.com/files/mukajedubogebajapexiborax.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/43731582770.pdfIn PDF document text
    • https://pecsikult.hu/files/file/63673694205.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/81524613756.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/96524001059.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/90305517212.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/54597951635.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/pukatudazivoripesop.pdfIn PDF document text
    • http://rideco.hu/upload/file/23623266519.pdfIn PDF document text
    • http://intertribo.sk/files/laxugiroravom.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/24563395353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+much+is+1+clovePDF 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_off0000ec86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC86 10324 bytes
SHA-256: db0965d65fd7b7bb46f983d9a4bb0fbcb3c07557226ea15b0ae073c63739de6d
font_01_sfnt_off000103dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DD 19748 bytes
SHA-256: a9ae3b18351305facad23a094bf144bcb4b642d8477a26e5998e7706f7325ed4
font_02_sfnt_off000137c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1