Malicious PDF — malware analysis report

Static analysis result for SHA-256 50819e951a74e73d…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 05:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a3c8be127372f8f3bc86628def6fae24 SHA-1: 9496d5ba1295c94a6538ee159ff686c355e54923 SHA-256: 50819e951a74e73dcfd97c155c21412be4baf1e84509f6288a19f42c64716241
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to external sites, suggesting it functions as a link farm. This pattern is commonly used for phishing or to redirect users to sites hosting malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://jakspravnenapsa.cz/userfiles/file/42586651700.pdf In PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/suxidorata.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/rezojifuxif.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/lijitaf.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210915202258.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/jigasor.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/2773354577.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/4971951047.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/89vsfsott56tubjtp59j9lauo8/69848157074.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/rixubowop.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16142941d22db4---dezibemepexe.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/vusijewixit.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/mazugijefi.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/40115381399.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/jezeturubirotubozigefaj.pdfIn PDF document text
    • http://cke.hk/userfiles/26028267943.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/levejetenojofe.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/ruzitobinurujesakilit.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/77461342375.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/kelenalazak.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/jikapix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=obey+rocoto+gta+5PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB706 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1D 10408 bytes
SHA-256: 4e3c9b9d83b3e2d536628e60b97c854f76ff446c81184b7a063e190e80ccf144
font_02_sfnt_off0000e6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F2 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1
font_03_sfnt_off0000fc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 21448 bytes
SHA-256: 8909c7d0f89b1d018a004af9d00d7578c7ad87fdaac3fe982cc9ce6f18003561

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