Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e3f38ade0e5557…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 02:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd6e95f0fe801e469592f7861c2b6947 SHA-1: e52b34b481bdb4a62065368085e881b55f309774 SHA-256: e8e3f38ade0e5557aa62f0141143936cafbf1acf67e26d8d58f33eddd2d23ee3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous embedded URLs, many pointing to disposable hosting, and is identified as a link farm. The presence of external URIs and the nature of the embedded links suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kamhosting.nl/ckfinder/userfiles/files/bifapilusudeteko.pdf In PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/53a4b607cd6cd27296f3518b09ff2c51/mojuvudekidasavagex.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/godotezotojusanot.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/77870511507.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/folisokoleniwuwobe.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/77064843436.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/jesamejotifozedawikek.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/84180256490.pdfIn PDF document text
    • http://www.polni.si/Images/files/57085436259.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/julodupewuregif.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/21458880270.pdfIn PDF document text
    • http://platcometals.com/images/file/zeloxenirolaferumivadop.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/50810366202.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/80004138887.pdfIn PDF document text
    • https://friendsofmultisport.com/ckfinder/userfiles/files/82392492332.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/pitazu.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/09210312909.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/6107048217.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/9107090199.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/lenujesazuvola.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/21941287896.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/92404937079.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406391e5205---fubuzi.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/7295864176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=i+manoharudu+telugu+full+movie+onlinePDF 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_off0000d9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C3 10752 bytes
SHA-256: 2181491c3eb9dd74d8794f9cddc9d02950614239278c6125c88a3c26931419d7
font_01_sfnt_off0000f202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A14 17424 bytes
SHA-256: b5606dd140a54fcaade1b0b74a5e292c3c186fccf42ba627f8cacb6c7501c820