Malicious PDF — malware analysis report

Static analysis result for SHA-256 e233ca168e96e1f3…

MALICIOUS

PDF

81.9 KB Created: 2021-09-12 03:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b21305a8bc6a25611a8aa47770e3fe90 SHA-1: be7b95e5b4799b764cf6583d30a9a4d9614022e7 SHA-256: e233ca168e96e1f3c362934023049ccb2a7af60801a8c9b5cebce152a0b35ba0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains, indicating a phishing or downloader attempt. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://mashhadgardi724.ir/basefile/mashhadgardi724/files/dotopadilosezemududewib.pdf In PDF document text
    • http://tangiahoang.vn/Images_upload/files/80319778549.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/7823779787.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/nifusesoxomunadolilije.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/bekobopexo.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/53872523714.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/bezebovi.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/88238123847.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/vofodobaxurutujopu.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/labitotijo.pdfIn PDF document text
    • https://anjingliar.com/contents/files/xinodotitobikisew.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/koluv.pdfIn PDF document text
    • http://moneymaker-gold.de/files/94660870302.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/ravefiruwuzaderapereri.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/savafoba.pdfIn PDF document text
    • https://tepihtrava.rs/files/23174429684.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/16756869976.pdfIn PDF document text
    • https://birotex.rs/images/files/84345630999.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/tavodenijawixaxas.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/paniki.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/gokal.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d26a3ba1ac---sededutirubawazonenebimad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=my+talking+angela+hackPDF 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_off0000dc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42A 17996 bytes
SHA-256: 707c1326f9d1661623180072e678b608e0ed1cedbdd052dd97219f127057f2b8
font_02_sfnt_off000122c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C2 10320 bytes
SHA-256: 22772e91c956de3daadd98aa32e0fabf5188801a812afa1ddaa54a0601055694

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