Malicious PDF — malware analysis report

Static analysis result for SHA-256 550d469586b38bd3…

MALICIOUS

PDF

84.6 KB Created: 2021-09-09 15:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f904b82c49624ecb49e51a501b7caa78 SHA-1: 28be95dc3f1a92f3569316f9ac8dbea313076955 SHA-256: 550d469586b38bd3560f4cf4b523d0db0e7e4b404c27cf29e69314f3af63670f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for distributing malicious content or conducting phishing campaigns. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://think6.net/ckfinder/userfiles/files/20210909152704.pdf In PDF document text
    • http://dajuicebarus.com/uploads/files/27790342312.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/zowatofad.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/perakadijit.pdfIn PDF document text
    • https://naves.cz/res/file/dagujidokipiduj.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/16982009664.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/28597513035.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/73135163991.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/wawujesonefi.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/mobuburaxeluzovajepe.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39457873877.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/juliwunetuzojitodafuw.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/34769540877.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/zobemusokasifujuwisi.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/kapavebe.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161303036537df---43870641301.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/tilelozajazijodu.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/memumigeke.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/22370279018.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/wolajamipox.pdfIn PDF document text
    • http://rurisnet.org/images/file/gepabetomewekogap.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/nazogawuse.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/zesuremigitojadu.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/71934475169.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/wufibugugezuzunux.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/59070239282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=day+and+night+wallpaper+androidPDF 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_off0000e2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFF 18844 bytes
SHA-256: b3f9a18e8b7b2c9b978fefe89268d031ceac7fde888cbab0c139b6df344a8b7f
font_02_sfnt_off00012b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2C 10704 bytes
SHA-256: 774171b51f8951453a0a8f196b59e312a87a775e42e3736a765181419d32b174

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