Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f97e0fce765f06…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 14:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9991d9d3815b6e4d5f0543b32ff7a2f3 SHA-1: 4924ff7e59558349b1452e89af23821df074c21b SHA-256: a2f97e0fce765f067246108975c21932988c083feb9adec50b85a4efc9d296df
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. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as evidenced by the numerous external URIs found, which are often used in phishing campaigns or to download further malicious payloads.

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://crewmak.ru/uplcv?utm_term=best+image+hiding+app+for+android PDF link annotation
    • https://balajitutorial.com/admin/userfiles/file/duratabilufesiba.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/bifawokov.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/wasaruvasukugagovufipedo.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/62245210414.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/kekutirofuxupevozoxu.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/99617203197.pdfIn PDF document text
    • http://tid.vn/upload/files/52261212039.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/posalikifuv.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/nugubobexubimafapuwet.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/rilejimupepufadukad.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/73827032669.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/11566012994.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/49039549255.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/67859311664.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/5465745915.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/33435876460.pdfIn PDF document text
    • https://ikima.fr/uploads/file/fumipabulobomovim.pdfIn PDF document text
    • http://usagimatur.com/files/others/41715310543.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/favoxivuvavowanenunozef.pdfIn PDF document text
    • https://kaparatt.com/images/File/62375149182.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/topamifuvef.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/fegeromaludafebobuf.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/58067503556.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16145fc1d538b6---dusesotizigadebo.pdfIn PDF document text
    • http://chanassociation.org/uploads/file/kurevakavijasibivikaduwe.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_off0000aff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF7 10952 bytes
SHA-256: ca7006d176c73c49f93dc1c8abb0f1dba12e48e302bc18dee26389a211d8187c
font_01_sfnt_off0000c8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F1 15496 bytes
SHA-256: f982a70e8011d2965ef873eb6e5c39fc3aa9fbe1690547b54d8d1f1936a4cfec
font_02_sfnt_off0000f010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF010 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1