Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1859ee3287f9c42…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 14:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 839d76cf4e6336d62fbc240584b240fb SHA-1: e4cc148a2450971fe470bec79f0a0d438d463349 SHA-256: e1859ee3287f9c424729c4b9787496df532f65206f68fe76facd730291dc3b62
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various PDF files hosted on different domains, suggesting a link farm or a distribution mechanism for further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://pistant.ru/uplcv?utm_term=my+virtual+pet+shop+mod PDF link annotation
    • http://centromedicoveterinarioadda.com/userfiles/files/vilezanozefafanemitumujuk.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021092616133973499.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/todajutipomu.pdfIn PDF document text
    • http://ausafe.net/images/art/files/wujidusudebofolixebopora.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/wabififepomik.pdfIn PDF document text
    • http://totoumi.jp/upload/file/gapifotiz.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/gosovupuvaletupupubed.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/kupiter.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/97870798104.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/totifudeluju.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/tamamiketejerigoke.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/nabowatemaw.pdfIn PDF document text
    • https://blugarden.eu/file/52661038931.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/67532147846.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/zararewededazif.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/gatowenijopixabepa.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/25192286077.pdfIn PDF document text
    • https://affze.com/userfiles/file/munakepopi.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/giwivozu.pdfIn PDF document text
    • http://zeci.nl/im/image/55016331699.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614877bc00aab---27760767148.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613540fda0d28---86538424109.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/86118835200.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/xaxewifam.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/jifarivupopor.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/50792476341.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_off0000aff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC808 10828 bytes
SHA-256: 8b6effc4750fcb2c2b4a05f1372b84251331fec734b3c310454e24fa03c3b570
font_02_sfnt_off0000e109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE109 14884 bytes
SHA-256: 0832fcfccb296577d4895b93141a1843dd814bf910a7daea1d8c2e24d24e8b7f