Malicious PDF — malware analysis report

Static analysis result for SHA-256 a674a7e5c01ad316…

MALICIOUS

PDF

70.0 KB Created: 2021-09-16 12:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eb38927dd1dbb7dc95223c290f7d8af4 SHA-1: 0bce95263932d9a2f5925e41420f509962b51400 SHA-256: a674a7e5c01ad3165d132c3efa62ce60942e5c3dbfbbb468bb25cd0f215bc955
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous URIs, with several heuristics indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript stream (T1059.007) and the nature of the links point towards exploitation for client execution (T1203) and potentially spearphishing (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://philabc.ru/uplcv?utm_term=ez+cash+unlimited+coins+mod+apk PDF link annotation
    • http://aerotechgroup.ru/img/outer/files/60769928856.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/gufixekebijelelow.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/tewaduxamigatedega.pdfIn PDF document text
    • http://eternaseguros.net/files/files/22465492300.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebb4ec16f7---wikuwo.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/barujex.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/76597512387.pdfIn PDF document text
    • http://land89.com/ckupload/files/lezokimudaxo.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/metilomolo.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/49844914056.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/bepupaduxorutaxewaw.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/47820334230.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af35cc1df0---75139354926.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/99680057865.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/wexikajesuri.pdfPDF link annotation
    • http://stellamaris.cz/userfiles/xesezexija.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/63421739328.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/bolaxifusepa.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/pejufidegubizaguvo.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/37520999122.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/25597627394.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_off0000b1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C0 10912 bytes
SHA-256: 7b7cc278c6f7abc5f42785427bcdbfd280b0723d2126553cc22454479c9a0b24
font_01_sfnt_off0000cad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E7 15728 bytes
SHA-256: ee9d885dbd42c45d5c2ce2a68184d813a37a9bc7e6de20e9c8b9fa71d2811d14