Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f8553b6c366a93…

MALICIOUS

PDF

93.8 KB Created: 2021-10-06 00:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 057c94c909758a7842da4f849fc8828a SHA-1: f4fda4b618db23cce52128b8b875fed5d61ebdc8 SHA-256: 97f8553b6c366a937c7406e0179de02906c324d527048496e5fe732b60e38d44
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The sample redirects to multiple external URLs, suggesting it's part of a link farm designed to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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 https://catamma.ru/uplcv?utm_term=six+existentialist+thinkers PDF link annotation
    • https://cuacuonbentre.com/upload/files/rozivovalefamuxatufip.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/23931866532.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/nopizolevemejevutevuwuk.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/eoaac59mu5n2i3v1cl4cksc7r0/sifutopajijafevelovitodu.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/fokulefememabinipej.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161413aa2502a7---nesisevigufetofera.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/68505078380.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/8491796081.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/99812427274.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/13110857098.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/91958989924.pdfIn PDF document text
    • https://nichebearing.leaddeehub.com/userfiles/files/7112902861.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/butezuva.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/99355602145.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/50811136004.pdfIn PDF document text
    • https://jurad.eu/files/file/30362918137.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/86890670620.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/88482686856.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/22246081166.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/21555226923.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/rarilewojikowakigisebanon.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/51431430103.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/78898369857.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/siganujomem.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/boxanoranaluluwiri.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_off000107e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E3 19644 bytes
SHA-256: 9682fffb951477c485ff28d9244ee03727b120f4538fcadbf122ce39a8eeb0aa
font_01_sfnt_off00013a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001522f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1522F 10356 bytes
SHA-256: d1b4c169443ff50146eca6911275008b9de447e03f157990c37db93817006b15