Malicious PDF — malware analysis report

Static analysis result for SHA-256 aabdd3db65856d19…

MALICIOUS

PDF

73.8 KB Created: 2021-09-28 06:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7eb373ab74ae98e3d3bfd42fff9feca8 SHA-1: 9e2b00bbf1a948fce140053dc905f9f19c7b9e04 SHA-256: aabdd3db65856d19a699b314c9d063f5c4fcfec3027ff4a7f38d90817719f939
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to the overall phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=ny+post+android+app PDF link annotation
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/81965101239.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136da14073b4---biwarolimaxixusasuk.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/kizaruz.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/betenedegiforek.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/rijititijek.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/bimojuzuvifemedur.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/97843567517.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/31470308374.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109191943495840.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/87720022218.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/nenazivifud.pdfIn PDF document text
    • https://haidangpc.com/contents/files/97661905713.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/gololikebebexozisali.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/ralesabilodapasu.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/21450840661.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/65620759314.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/96746409212.pdfIn PDF document text
    • https://superpart.com/files/nigovedugipazakewazakanil.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/jojemidimukubedipo.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/xomudufefewo.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/bezifusidenalaxiveku.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/71756463792.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133f11121a9b---59826357627.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/36201522890.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/jogejizebunewiseso.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109280921475808.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/68944595930.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_off0000bb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB89 17944 bytes
SHA-256: 65937d80702ff38d5d803cb6fcba7d96e903fe01e9962394010b90631aaed710
font_01_sfnt_off0000e9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 10296 bytes
SHA-256: 69f7946ad210f406703407416354912e919cb9d4b408a7c2961b5f536aa14947
font_02_sfnt_off00010153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1