Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eef39f7d50509cd…

MALICIOUS

PDF

75.9 KB Created: 2021-10-14 20:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cfea26ac82a38de7d049a8b93743a92c SHA-1: 5a828b3abbec063313f0075842262669dfa7eab2 SHA-256: 2eef39f7d50509cd70645ea6a2ca407f20dd1c005b34cfb146541348b14b13ff
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of JavaScript suggests an attempt to execute code, likely to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://locum-system.pl/userfiles/file/12102915577.pdf In PDF document text
    • http://noithatsah.com/webroot/img/files/gelaxugezodabipob.pdfIn PDF document text
    • https://mimpidia.com/contents/files/xutupiwegu.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/85526565441.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/xivoletiguzube.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/mogujanaba.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/2254647163.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/40021411814.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/tinoxeputu.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/xabulusojoxizezofufawuso.pdfIn PDF document text
    • http://tuyendung.btccorp.vn/uploads/files/gatadasorotiminoso.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/20494154603.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/dijulafeso.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/18835478272.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/modub.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/jobigigonusil.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/tikabojugon.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/jenitanibuwod.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/kigololekixaluzenaza.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/23220308030.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/narotetaxabebavisagupi.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/banimo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/78922225151.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/49940719673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/Z3ufxtS7Wvw/uplcv?utm_term=star+wars+live+wallpapers+iphonePDF 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_off0000c2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B9 10576 bytes
SHA-256: d9dd0e98726a5825a795a67ce841a6b8908eb3250cb9dc3d1bad6896d9b0f0e7
font_01_sfnt_off0000dad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD4 17872 bytes
SHA-256: d048e442bd8d90291b04977a2f4c01e1d8eb62f3e8d4737ea6d913b7e94cc278
font_02_sfnt_off00010981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1