Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ebe5c807806898…

MALICIOUS

PDF

82.1 KB Created: 2021-09-14 04:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5a67a7172339e5102661695c733e5395 SHA-1: 587c50cb684d424c4a740248bf47af17929e5562 SHA-256: a7ebe5c807806898b74cacb8ca8ec0a95916c40d35d6aa6e4aa684f4d4015368
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, many of which are disguised as downloadable PDF files. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the primary goal is to redirect users to malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=dipiro+pharmacotherapy+11th+edition+pdf+free+download PDF link annotation
    • https://hyosungulf.com/uploads/file/vetofuwobelinefowifiwe.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/51603218775.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/kizodepupisugelaweg.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/88736260814.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/71284800995.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/58296435120.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/ronixud.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/9851160352.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/gogal.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/55580185993.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/savoporaka.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134da9b76db9---66161273239.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/16394090192.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/58466374563.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/55767876182.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131930ace678---44245556994.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/gesibeji.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/31396817759.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/pibigarobol.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/ladotomobigisunugogibogo.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/famofinazoxi.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/10108932438.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/resagitopuguzibarobate.pdfIn PDF document text
    • https://bem-sa.com/img/file/3285547270.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/mujufatoxijenonazir.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_off0000db5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 10972 bytes
SHA-256: 9735602583081fb77a9c42cf3df8d35ac94c648e0047666d2c7d484b766a5c37
font_02_sfnt_off00010cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDC 17500 bytes
SHA-256: 31114b0d0792c4bc5614372cc435adc7b3127ec79b08c5d7154591876e275d24