Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a70bcfbf41a302d…

MALICIOUS

PDF

72.8 KB Created: 2021-09-28 04:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8bb9bec31fe93ac263378d563b6b44e0 SHA-1: 318535f35277da2e9d1885667b419f48b6419780 SHA-256: 0a70bcfbf41a302de045a7af3ca7d8f3572f3ee2dd0f2ebd9acc13bf2a5458fc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://etrustmi.com/ckfinder/userfiles/files/73805374949.pdf
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/niparir.pdf
    • http://shinhwajudan.com/userData/board/file/4586007802.pdf
    • https://asiastudy.in/ckfinder/userfiles/files/wawowobosirezuri.pdf
    • http://gift-founder.com/archive/upload/files/mulimafafeze.pdf
    • https://kudamatsu.org/userfiles/file/somenutumibuwevupotufidu.pdf
    • http://bjsixiang.com/jingkelun/userfiles/files/20210902143527.pdf
    • https://cupanghitam.com/contents/files/bakomapusukakaf.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee5420b053---jalaxukasu.pdf
    • http://www.radio-kum.si/data/files/sadaf.pdf
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/11766507290.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613d165319fe7---99324765082.pdf
    • http://terremeraude.com/userfiles/file/jifexorovuz.pdf
    • http://arredamentoambienti.it/img/file/73649974848.pdf
    • http://nomayaku.com/userfiles/file/laxilajasebadaxemu.pdf
    • http://hig-hegmann.de/userfiles/file/3751677040.pdf
    • https://planningpvedh.nl/ckfinder/userfiles/files/88757292295.pdf
    • https://springkasteelhuren.be/userfiles/file/99333885067.pdf
    • http://surveycook.com/upload/tmp/202109/file/wumufuniwubosuna.pdf
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tomipat.pdf
    • http://dynamicyunnan.com/ckfinder/userfiles/files/mobifalokoperibuv.pdf
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/62879783469.pdf
    • http://hataylezzeti.com/resimler/files/47813225906.pdf
    • http://jar-ted.pl/file/5925031103.pdf
    • http://futsalcb.cz/picture/vtextu/file/7943790438.pdf
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mumum
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=top+10+android+launcher+apps
    • 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_off0000b7cb.bin
b0621d292b947afaf8bb3014284fbbc526e00080dc81fd371cbf57568ab90b83
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7CB 10752 bytes
font_01_sfnt_off0000d069.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD069 16792 bytes
font_02_sfnt_off0000e87b.bin
b470c3c2277dec51730bc4bc269803ffd6923cd366849be5524abdd16bb8e12e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE87B 17712 bytes