Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fff352b71f92e2c…

MALICIOUS

PDF

79.1 KB Created: 2021-09-20 08:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e3dcefb0ad4427b43da90344d7f3ceff SHA-1: 925f04a302f05868332eb066f4f5706411acb1e3 SHA-256: 6fff352b71f92e2c77f8cb762346c2b11ce5dd17fa2ee2fd7b1d10354dd5f379
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript 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 suggested by the numerous PDF_URI and EMBEDDED_URL heuristics, which are often used in phishing or malware distribution schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://limsurempat.com/contents/files/pozovuduferunilo.pdf In PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/jakuresejemukedunarenu.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/pavagudesasewaxuza.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/55279554344.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/56611179475.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/91291496926.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/totinanamifisudate.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/99800191308.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/voitlptcud403lr2mdv3udf9ng/bugeduwituzerizokif.pdfIn PDF document text
    • https://aayams.com/userfiles/file/3149843919.pdfIn PDF document text
    • http://plusdesignwebsite.com/userfiles/file/gazorobiniwof.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/jimegomalimedan.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/37162864426.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/fafotiledig.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/vaxazuno.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/xiwodijiragabibuzajikatad.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/29610840847.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/82833958485.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/94155355279.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/wawumudegofex.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/95171386651.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/verelimaruwo.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147828834f0a---83363151511.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/nexuxapuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=8+letter+words+starting+with+maPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/69924493715.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_off0000cf10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF10 10892 bytes
SHA-256: 374bceb1bdf25a954f3b20bb403b73a8ebb632b18f77c93c954dae2d2dee1513
font_01_sfnt_off0000e7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E0 18260 bytes
SHA-256: 36cd824d8e9a97d61a5790165c1601ce3677561cfd6e7e923ce7825bcb913afd
font_02_sfnt_off00011676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1