Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f04b75c4b77934b…

MALICIOUS

PDF

87.6 KB Created: 2021-09-20 11:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a368e2d988dd7fd8be9cd7496ebae3e3 SHA-1: bb5261e2f48e414a1fd711d9029e43d9766b85af SHA-256: 5f04b75c4b77934b2b0bce70124b5b50e9c36780514b4dcb33e5c04cdd3b4be0
134 Risk Score

Malware Insights

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

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, likely involving the execution of JavaScript to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://topoint.cc/userfiles/fckFile/20210912193831.pdf In PDF document text
    • http://tuecpa.com/file_media/file_image/file/91809940761.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/rorizuzusimotowokomamozed.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25687197296.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/19821027173.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/ronikadisixukibodapuwefoz.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613510a173bb3---muxepiparovekujupoveji.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/bukowisofav.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/ruliboxif.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/kusegosisimonej.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/ziromiromesazebevogiz.pdfIn PDF document text
    • http://elpijisystem.com/file/jesikonakekav.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/36227721755.pdfIn PDF document text
    • https://csn-alliance.com/data/files/karejigumupituzalulelivuf.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/gakuguvetojifuf.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/24851695004.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pejulukopuwuruwasiku.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210917162319_1572818608.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/16356784372.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fopidebevowi.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/16824153187.pdfIn PDF document text
    • http://furniture83.com/upload/files/dolizezelixovipap.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452285e957b---10819794229.pdfIn PDF document text
    • https://petribax.com/userfiles/file/jaruga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=poker+face+apk+unlimited+moneyPDF 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_off0000efd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 18104 bytes
SHA-256: 517f791cf2e33a574cc82606163b78070d48838b1ebe5a8bcd5874d46040c035
font_01_sfnt_off00011f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F51 10920 bytes
SHA-256: f1d406314be75df8814b9725cdb0c013ea88d636c0cbe70892fd0e69d4b32e48
font_02_sfnt_off0001389e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1