Malicious PDF — malware analysis report

Static analysis result for SHA-256 40dcb640212aa274…

MALICIOUS

PDF

84.7 KB Created: 2021-09-21 00:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 808b12c40d8563a138d963c4938e4c54 SHA-1: fcedbd5a06afd6cb4371e36007661f0daf0c56cd SHA-256: 40dcb640212aa274c257bd8c97bb86cd1593dab6bfe766003f390f4d51fcf265
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying a pattern of linking to many disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://crabandclaw.com/uploads/files/78158363407.pdf In PDF document text
    • http://huichem.com/ckfinder/userfiles/files/sivotuzewubopijagowo.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/41647529682.pdfIn PDF document text
    • http://metzlerranch.com/userimages/31568680527.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/mogelulanufikulomafataf.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/10504356323.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/siwobudox.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/xasurito.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/juxaxemura.pdfIn PDF document text
    • https://penal-garazh.ru/files/tikevewageto.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/92382087725.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/waxonolipukolijofi.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/zibujulofileseteros.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/4159458921.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147bd4e50fcf---14782623178.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/93618388367.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/33428018443.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/7fjhunruev1irqd6dkk7618r0e/kovokekawen.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/dagiwefilenewubiwabuj.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/31484628884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=naijanet+hollywood+movies+downloadPDF 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_off0000e71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71C 17476 bytes
SHA-256: 94aff8fa7543993456b0178616565ec657e0cb2c7db6ed114ebb7109d1121be3
font_01_sfnt_off00011488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9F 10788 bytes
SHA-256: 5b752edc0e8f8feea5bee79ae462bad6d53e699d8569727bfd436dfd4a913f3f

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