Malicious PDF — malware analysis report

Static analysis result for SHA-256 81537b211711c57e…

MALICIOUS

PDF

71.8 KB Created: 2021-09-13 01:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 530706f67de49847202aab8a9170b5df SHA-1: d9097e854f77f3af8c0bb8f2d98e2ace0803566d SHA-256: 81537b211711c57e94f50fae691d9e7f0466d56b787a7e9d8b799f0c77c81860
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of multiple unknown URLs points to potential destinations for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://wheelmartthailand.com/image/upload/File/61488190139.pdf In PDF document text
    • http://langeline.com/ckeditor/upload/files/xesilubozapudawalakibu.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/16760967922.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/44950516594.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/pojixaxaxemivolaponesij.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/15718036508.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/9130780611.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/52689626785.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/22548447700.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/ratakakutolozutuxob.pdfIn PDF document text
    • https://edex.co/userfiles/files/renijejagareroxemafopuz.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/dewaximemoninon.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210910152757.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/99785530560.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/lejujipaxularajolukor.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/16353290500.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/65953351250.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161394cfeceeff---bovelagifik.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/kepigugofig.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/73737623265.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/zesan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+do+free+apps+make+money+in+androidPDF link annotation
    • 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_off0000b673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB673 16524 bytes
SHA-256: 08659f0febd18bb3e382e1ae6ab4ac95f220327aa269ff7fd380fdd9154f3d24
font_01_sfnt_off0000e0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90E 10796 bytes
SHA-256: a8d8395ddbf89d8bd89ff5098b3fbf1d69de2be71a280535f3f4c6401dcc84d0

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