Malicious PDF — malware analysis report

Static analysis result for SHA-256 64958cfae222253e…

MALICIOUS

PDF

68.9 KB Created: 2021-10-03 18:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 83c234185370425a930ae8f9b3039ca1 SHA-1: ef278e2bc7ee78fe8e524aced22a242833a1828f SHA-256: 64958cfae222253e2d1d1d7370a08838b7efa441649c2779b1e5fbaf65809a7c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://vsevolozhsk.mebel18.com/uploads/files/zuzovef.pdf In PDF document text
    • https://btegypt.com/file/sonobiwomelivikamuz.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/kufodukumawera.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/20024877601.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/vibubusedimeva.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/83451927509.pdfIn PDF document text
    • http://adice-area.com/pictures/files/mafejojupomuwotujesewat.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/84781567688.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/79814932278.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc1f9dbf39---58703127211.pdfIn PDF document text
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/11434331549.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/xusovagokufeboxo.pdfIn PDF document text
    • http://budropol.de/Upload/file/dinaf.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/91936935290.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/11503645406.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/visusidotofig.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/tirizopagefepesiluro.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/98276822556.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/64551147972.pdfIn PDF document text
    • http://unseretochter.com/images/file/dulelupuxinamufinelofax.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/janumabixelaguvala.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/32991295214.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/76703253198.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=what+is+finite+verb+and+non+finite+verbPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1D 15588 bytes
SHA-256: f1797b1f133096b70383ff855dcb585a3afd2654f3ebc9b625d7ed356ab53a6f
font_01_sfnt_off0000d5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F0 10604 bytes
SHA-256: 83720ae94d35032be13616d29c3660c2ff008f873bb134d14531d6781efc5aa7
font_02_sfnt_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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