Malicious PDF — malware analysis report

Static analysis result for SHA-256 346a2129cb064c5f…

MALICIOUS

PDF

68.3 KB Created: 2021-09-19 14:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7638b9bdf41df0d3fde6785bc0f74ef4 SHA-1: 466923e371ad45c34161e5cfd484bce7252a9549 SHA-256: 346a2129cb064c5f6eb3b90e078d3193f562edce399f3a710d0c153eec8da7ba
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with a click-outward action, typical for disguising malicious links. The document body is heavily obfuscated, but the presence of numerous external URLs, many on disposable hosting, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://nomylo.ru/uplcv?utm_term=cast+of+the+movie+soul+surfer PDF link annotation
    • http://adasbruiloften.nl/userfiles/file/47291153005.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/84471520787.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/47397281.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/64236062462.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/vasubawamekujoxil.pdfIn PDF document text
    • http://epmachine.ru/d/files/lakor.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161321101863a4---midupepisexogufipewata.pdfIn PDF document text
    • http://slsnn.ru/content/files/66597141279.pdfIn PDF document text
    • https://renetravel.ro/images/files/jubagizejevakugiwumexoxe.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/puripesema.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/napalivumumipemizewarixuz.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/ravovilikatisexikobarupav.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/munisutejevaduf.pdfIn PDF document text
    • http://boldogelet.hu/media/50377017416.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/97701650623.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/galavumatafuj.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/59887743793.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/disisamurujejizumuzoni.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d713b5296---wuxoxipuzux.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/wutana.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-6/20210906035513262708.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/togukojokiwiduvitexutudow.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210902/file/33099799754.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/6284989922.pdfIn PDF document text
    • http://winso.tw/userfiles/file/tutawik.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/folufijorumamivi.pdfIn PDF document text
    • 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_off0000b0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D8 14120 bytes
SHA-256: e8380607d60c5606705831dc8c8149088f8797fa5eae56b479284582a7bbbde2
font_01_sfnt_off0000d3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCC 10572 bytes
SHA-256: 4ade2e89e0afd31e09746db195092dffc545d71e9045b5a57d6acb19290dd79b