Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37d210ad7263048…

MALICIOUS

PDF

72.3 KB Created: 2021-09-09 21:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 03fb512cf62e7c75e3945fbd309c6dc0 SHA-1: 025123478b12371b2458f016a3ace9b07bc24d6a SHA-256: a37d210ad7263048f5209fec179e868cc9433b479e53d873c125bf50c66521ca
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to distributing further malware or phishing content through the numerous linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://nucamsa.es/userfiles/files/xigetonitulavugiv.pdf In PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/nakilogut.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/pupuxesedotefafodev.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/roxifewu.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133ca14b17e3---56038269116.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210906014411.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/62003059342.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/40331862724.pdfIn PDF document text
    • http://precisao.org/files/files/74400175778.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/13790276323.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/lipotobemu.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/fokunirenupeduwolazo.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/48151114137.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139dfdee9786---25792984839.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210906000721.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/gesevoma.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/sakupirawig.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/6078041564.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/navegim.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/72326406011.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/80845407844.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/6375566085.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/657271990.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///figezolobodone.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/38338868837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=damon+2+pro+apkPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/13193256633.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_off0000bc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC45 16064 bytes
SHA-256: dfb48a4d2d9c3679a208f3d54b1ffe038d1bd867c8fae0e00bbfd7941ca0c860
font_01_sfnt_off0000e580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE580 10088 bytes
SHA-256: 16a2afe5dc803c8c0688b394ce75f8eb869e55e0e3b748ba3537435bd1315fbe
font_02_sfnt_off0000fbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1