Malicious PDF — malware analysis report

Static analysis result for SHA-256 2118fe28cd9b941f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 18:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d257c3fab1c37685e26cdcc8e29a198 SHA-1: 9a9350937f03625ff673ef04db32065faa87b618 SHA-256: 2118fe28cd9b941f8436769db12cdb5c1eca226c85c61b998e8ad8bbf56c9494
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users to potentially 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 nature of the file suggests it's delivered as an attachment, aligning with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://amrapalispot.com/userfiles/file/bikarugunawixiv.pdf
    • http://aptwash.com/userData/ebizro_board/file/zikabavejaboxonasedogowad.pdf
    • http://cardealer-space.com/js/upload/files/tumawudedu.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/b70b47a2063835d3e407541b5f87a3c3/lexarebixujakoze.pdf
    • http://ex2010.com/uploadfile/file/2021090422423973499.pdf
    • https://hyosung-gulf.com/uploads/file/jijixogovobewikoji.pdf
    • http://yakutiaprime.ru/SITE/files/editor/file/96274969674.pdf
    • https://k-newsletter.com/ckupload/files/61560760477.pdf
    • https://dreamscapes.ca/dream_scapes/userfiles/files/92334568151.pdf
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/buxawukob.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375f668901c---98505217583.pdf
    • https://weishinclinic.com/uploads/files/202109050446539326.pdf
    • https://noble-program.site/js/ckfinder/userfiles/files/bunorobimotudonimi.pdf
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/2669778839.pdf
    • https://speedwayinfo.hu/uploads/file/visepofejewujetarej.pdf
    • http://kazuma.ru/ckfinder/userfiles/files/loretufibopuza.pdf
    • http://rioairporttransfer.com/ckfinder/userfiles/files/vudepemigizinimafubime.pdf
    • https://cribpointonline.org/cribpointonline/userimages/file/68135528816.pdf
    • http://phanphoiongnhuahoasen.vn/upload/files/bejosinozejejalu.pdf
    • https://www.truck-transport.com/ckfinder/userfiles/files/83774748677.pdf
    • http://ukonlinedirect.com/userfiles/files/73966907935.pdf
    • https://csp-pub.com/stockages/files/17218487953.pdf
    • https://myagenda.myagenda.cz/pictures/editor/files/63774783622.pdf
    • http://aiaato.com/FileData/ckfinder/files/20210902_A05D6784D743A88E.pdf
    • http://ventensis.lt/public/ckfinder/userfiles/files/94022709557.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=using+the+periodic+table+lesson+1+worksheet+answer+key
    • https://rt9.rspo.org/ckfinder/userfiles/files/bolipodubewobirubup.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfe3.bin
3f4dbb8bbc71af6cba1ed47dcd477f8f39627a72aab48f7cc2e2acf6c5eb4154
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE3 11284 bytes
font_01_sfnt_off0000f9fd.bin
2e3133302d5e31e82d1d482993b2e0bcbcb9b481c31ccfbff3ef6d86e335dc8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 17196 bytes
font_02_sfnt_off00012691.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12691 16792 bytes