Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19ad8f5ca5855cb…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 21:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5fb45b1e5058df8651dcbe5b699b41a3 SHA-1: 769abecea7f43eedfcdcb793f6efb6e6f2d7f8e3 SHA-256: b19ad8f5ca5855cb991428ebba0dd623f2088dfbd6e395a92599cf0164514221
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a spearphishing attachment designed to lead users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=gmail+settings+for+android PDF link annotation
    • https://fanaf.com/article_ressources/file/64788531182.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138f2c112efb---99686126707.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/kulodanelowikan.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/temewufozovurarowewo.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/xufuxixube.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109050019005443.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/dodegidase.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/83233042577.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/kipipavogejexuxele.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/zilunokavo.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/57944517347.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/lajawedigizevuvirebas.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/wefunulaxobomukigugusop.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/gamagiduwajujukukez.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/gaxumifufonokebabomala.pdfIn PDF document text
    • http://greenglobepms.com/uploads/kuwofilipunokuxolarironi.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/30513251061.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/rovera.pdfIn PDF document text
    • http://xprchemical.com/upload/files/dipalubalen.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/91467852051.pdfIn PDF document text
    • http://dsagco.com/Upload/file/fidudozimipuvuruta.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/40193112064.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/piwenonuboxabapidu.pdfIn PDF document text
    • http://juentai.com/userfiles/files/84955427839.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210909110910807903.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_off0000e027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE027 18824 bytes
SHA-256: fade7dea2ee26ab5757d778ade89ce79a2fdebdae20476d6099dfaa2f4d0738b
font_01_sfnt_off0001115d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12974 10736 bytes
SHA-256: 0372ec51f0107e21117aca6f8ee482d28dbd40dd05eda43a158fe0786e2f1e2f