Malicious PDF — malware analysis report

Static analysis result for SHA-256 8895c0f13837a7bd…

MALICIOUS

PDF

74.9 KB Created: 2021-09-26 22:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c356fc66ccea6b46ebe2e27b1752289b SHA-1: 7995b66445a52197df98351daf8b18e9ea15e863 SHA-256: 8895c0f13837a7bd9caad65d383b37e3ac0c26c59f9c57c122aa1933f48e7021
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 T1059.007, and the overall delivery mechanism is consistent with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://salukool.ee/upload/userfiles/file/zozilu.pdf In PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/tiwixarazoxelukorosoj.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/40643711926.pdfIn PDF document text
    • http://hkwwta.org/userfiles/kobapi.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/kifepuvimiv.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/xavatepimamut.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/zokaru.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/66921814388.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fd0ca33f9f---sazaxisisetukosevo.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/70258514785.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/84751548782.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/pumivotimalaxerizu.pdfIn PDF document text
    • http://millecolori.it/images/file/37437200649.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/lenewoxekasovupokano.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/gosagesig.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/37320472189.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/mizusevam.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/lusekekofowapatifiwowelu.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/77537321275.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b088db6143---6514427103.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/41239079361.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/mijonijavega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=baldi%27s+basics+unblocked+66PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB006 15192 bytes
SHA-256: c3523ae28a37cb4fd961879cb08971c5a9aeda3e50a72d362ef4c48eaf55d136
font_01_sfnt_off0000d67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE95 10752 bytes
SHA-256: 3ab5f0819d61948738770da811db12e729a9c0a2e5928a47da42c7a9bee9808a
font_03_sfnt_off00010774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10774 16140 bytes
SHA-256: 2e40c969e06661a541bab8cef666ebc654a0d8416a3222ef5092975c876ce786