Malicious PDF — malware analysis report

Static analysis result for SHA-256 904687eed51a6609…

MALICIOUS

PDF

82.8 KB Created: 2021-09-23 22:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a7106849dcca52ee50e2598f8ccd4718 SHA-1: 03f9ed423485db6aecbbb2587089181a60009779 SHA-256: 904687eed51a66099c9c3f0bc6783b19f70263a817d5aeab65de42dee86221d3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a large number of external links, many of which point to PDF files on disposable domains, indicating a link farm or redirection strategy. The embedded JavaScript likely facilitates the malicious activity, possibly by redirecting users or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://rideabikenews.com/user_img/files/jojasemixezaxemeso.pdf In PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/24427856591.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/sidifivilugudupo.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/tifoxiweto.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/vaxopirudenobesegavo.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/30696788271.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/mutajakekufalomuf.pdfIn PDF document text
    • http://xn--80aer5aza.xn--80aai5amepo3c7b7a.xn--p1ai/ckfinder/userfiles/files/76018182188.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/dikepisewesidekike.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bce1368038---98884325974.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/13166762813.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/3470215005.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/73468892502.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/45779676816.pdfIn PDF document text
    • http://isvpro.com/custom/files/poned.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16139a8c4358f6---fosevujuguzexezawobinekav.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/75127742551.pdfIn PDF document text
    • https://curvy.tw/upload/files/sowikopizikowovurekewi.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/gemunipezinefed.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46035600509.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/jupabinovetuleramepuguxi.pdfIn PDF document text
    • http://xtra360.net/campannas/file/bukuzixiworupetasobif.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/lumivasoxixa.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/58264428905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=watch+the+bachelor+season+18+online+freePDF 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_off0000dd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0E 18136 bytes
SHA-256: 4e86101a6e3dfa1cca4776e1d62ee675049955395d079b776210f6aad3ddb27f
font_01_sfnt_off00010c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2E 10828 bytes
SHA-256: 06f6e9ff0f5c4a66d9031cf89bce2a25edb52f1214c3a2fcf8203765ecfdd810
font_02_sfnt_off00012530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1