Malicious PDF — malware analysis report

Static analysis result for SHA-256 678350454a3f29e3…

MALICIOUS

PDF

79.1 KB Created: 2021-09-09 16:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ba6479c317738f66aaf3131dc6931d1e SHA-1: 123ab5050e12e902d70b865008d3f6ba865c598a SHA-256: 678350454a3f29e3fcb9c3324ecb276bd38cf5c39002e82a6516187c323e2f52
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=march+pdf+john+lewis PDF link annotation
    • http://nhactheducthammy.com/upload/files/zizatutumemivadipebural.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/datemuse.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/tugewowetuvudobufugigewi.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/10098876213.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139b29dc527e---kudogomalidupagukaze.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/xatosasoba.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/tibapezekoniwiv.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/16306894821507507709.pdfIn PDF document text
    • https://magerp.org/upload/files/36106661712.pdfIn PDF document text
    • https://premium-house.uz/images/file/volelolafimexorefoka.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/timofulixenuxal.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/19213171194.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210906124725_fgjrei.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/37011932666.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/tebusexijufepemojol.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/fumugojadogijitasu.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/nufazokulewoxobugapodi.pdfIn PDF document text
    • http://emeat.ru/var/files/2740969505.pdfIn PDF document text
    • http://qqwandai.com/uploadfile/file/gevokidalegopaxisumejo.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa7e9ac60e---26555173508.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/85697553990.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/zonojufajunijekigixojer.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/lixosukezepiwefeguzalem.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/60446472236.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_off0000d19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19A 10828 bytes
SHA-256: fd6596b2527f86ea3b9385929b4fccab13235a665d17c31e13cd5f682f5af70d
font_01_sfnt_off0000ea7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 17228 bytes
SHA-256: 3a5b7d22ede3f534cb103368c72f2852b1860cf8fce9b048d84fd3f734ac952c
font_02_sfnt_off0001172c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1