Malicious PDF — malware analysis report

Static analysis result for SHA-256 4742c4f03b597eea…

MALICIOUS

PDF

84.1 KB Created: 2021-09-24 11:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0efc3ce2d3ba71792b752ee291feaa39 SHA-1: 83f6fb900dcebe92f8813e074bee1febdb048b51 SHA-256: 4742c4f03b597eea6a8ec1024ff4a92b08a508edf11e59906a2b90eccb37719f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior, suggesting an attempt to distribute or redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://kleinschaden-expert.de/userfiles/file/80347159706.pdf In PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/97729678580.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210911053051009.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/rodotuwatunuruwapitiref.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/5631657712.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/24378214953.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/feberipuxaxumasifoma.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/38099646536.pdfIn PDF document text
    • http://lepixz.com/userfiles/file/xigukaduzi.pdfIn PDF document text
    • http://npas.ru/pic/file/jusexawapijemenetesofogun.pdfIn PDF document text
    • https://tomas-music.com/contents/files/noxobuzijogidevamelew.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/dejutamedurifinafab.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/botem.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613630bf57716---58793630241.pdfIn PDF document text
    • http://duef.ru/public/file/61385802772.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/79584317930.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161443268dc63d---15188951057.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/fusezuxo.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/kopores.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/jidemevebomosanofo.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109211309299481.pdfIn PDF document text
    • https://jobtiara.com/files/files/36186322278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=rules+to+find+integrating+factorPDF 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_off0000e62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62C 16848 bytes
SHA-256: b26f33fc7c81fbdd509b620f986fad501a0547e188f66cc3082b4272e91132db
font_01_sfnt_off0001125b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125B 10796 bytes
SHA-256: d12ab1c40d91d0ff83727b3a9c2679d0b99e5120a28c344ea38c25c3a6680bf7
font_02_sfnt_off00012b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.