Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d5ccaaf93f9ae1…

MALICIOUS

PDF

82.2 KB Created: 2021-10-10 00:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b4e79b83d75c334630f85bd7b2394b96 SHA-1: acc5626cd8e2c0e6069a9b6b5bb2432a018a9d86 SHA-256: d3d5ccaaf93f9ae1fd1a4e3b1c2519f025f4cc2c4b53667e72a04c0e46be38aa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. The presence of numerous external URLs, many of which appear to be link farms or disposable hosting, strongly suggests a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the malicious activity by interacting with these URLs or executing further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://wastran.ru/uplcv?utm_term=triangle+inequality+vector+proof PDF link annotation
    • https://ocloud.millionserenity.com/images/upload/files/barazimewikoti.pdfIn PDF document text
    • http://7sate.com/filespath/files/20211003162213.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/46624847214.pdfIn PDF document text
    • http://hbaoge.com/upload/files/70090319046.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/64523906477.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/43736326378.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/28737259518.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/75216901161.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/57492805949.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/70187138772.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/kelamejafivufefixezu.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/woferuxefaxusuzikopug.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff901d516e---37290718108.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/85792406698.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161589f5d6f61b---vilurizet.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/15194158442.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/zupesokejunef.pdfIn PDF document text
    • https://andhimazhai.com/images/files/sinam.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/jogiloxosarulokef.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/juzosodi.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/megiwowabakanotozobupaw.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/62937360245.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/wirafomegetajudo.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210918_101212.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cab6f380f0---55987049565.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/26840008158.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_off0000d601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD601 19172 bytes
SHA-256: b6c0dbc26fa850b53ac81cf174ccd73891a3d6ff17d103f90b20e00096b490b1
font_01_sfnt_off00010994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10994 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AB 10876 bytes
SHA-256: fee490b7568cad2f19702d685572eb9f9090c6dbcddda73f3aa9e30ec024423d