Malicious PDF — malware analysis report

Static analysis result for SHA-256 f06a43d27d3fcb87…

MALICIOUS

PDF

74.3 KB Created: 2021-10-06 17:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 8462a2241d63a3e2d91ba420cda8d7be SHA-1: 09b04b8bbee08198bafd32e4b0206ae6ce16504b SHA-256: f06a43d27d3fcb8717bdc4be7d352717cda7748d5765d1ec9c20ea425ada5a9c
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to a link farm, likely intended to redirect users to malicious websites. The PDF structure and embedded content suggest it exploits PDF vulnerabilities to deliver a payload or redirect the user, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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://huntic.ru/uplcv?utm_term=performance+review+phrases+policies+and+procedures PDF link annotation
    • http://vanhacollection.com/images/files/fopubodijerexapazavej.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/javivebiguraruvilaputex.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/momax.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20211005084838.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/12271213425.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/jatuxunaxigudimotob.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/filogesiwanuwesipijupi.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/16643884066.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/sedulor.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/gobaro.pdfIn PDF document text
    • http://change4best.ru/upload/file/pejajafejozenebakob.pdfIn PDF document text
    • http://llux.vn/uploads/files/jonabiwomam.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/81655842688.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/32725951245.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/48869515751.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/toxazijaronexetimo.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/83822682015.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/72947440091.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/bupofawopilaforo.pdfIn PDF document text
    • http://hotechike.com/files/files/88512578696.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614fcb29418d5---77139768363.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/97361057060.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/kulepo.pdfIn PDF document text
    • http://adfaveo.com/image/files/20210916_212932.pdfIn PDF document text
    • http://ruihuitax.com/files/file/tuvimevarewezaxevaxo.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_off0000bdf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF2 11040 bytes
SHA-256: 2da8f7376fea81acaa0d9efe5ffcc1ced680ba84b89c8662953e2d3efda92b39
font_01_sfnt_off0000d779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD779 17336 bytes
SHA-256: b718264be16b1541aaa2b50c7d7ae428abda624b6c644af14d949d593b76e455
font_02_sfnt_off00010353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1