Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce6fbb17813e46e0…

MALICIOUS

PDF

79.5 KB Created: 2021-09-24 06:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5ee0dcc49a70ee05085d9558d1657979 SHA-1: cd2e78d38bf9f59bfcc673fd2b9d23dec72b4d93 SHA-256: ce6fbb17813e46e0546035e539bd4cec4ff58f7a098fa8e75133cc111a3196dd
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript and numerous links suggest an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pixomot.ru/uplcv?utm_term=block+pop+ups+on+chrome+android PDF link annotation
    • http://cerescommoditiesltd.com/Images_upload/files/newez.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/62108774605.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/46215080538.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/xenumumozufupi.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/56151113921.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/49669127912.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109082128543425.pdfIn PDF document text
    • http://ubest.ru/images/file/2218623680.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///40092884859.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/filenamofigozabiluvimota.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/wasavadegotuzunanexadumun.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/wofomon.pdfIn PDF document text
    • http://zae.me/datafiles/file/lidebamowakim.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/febelizoza.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/danawinufururetuk.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/22165892319.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/nodekakogo.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/22677118091.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/49373548192.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/vomezanikinamopogujufubo.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/42932203731.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/8216585770.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/69699734968.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/pugibevufiru.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_off0000d2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 10928 bytes
SHA-256: 7f145b886f889c89fee7efe173ec8598b744b5e2389ff1261df5d07b63140a99
font_02_sfnt_off00010404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 17360 bytes
SHA-256: 5e9c014297a4a1b4dbeb3fc6fa39405fdd0076e176e772d24c608d7da20eb3fd