Malicious PDF — malware analysis report

Static analysis result for SHA-256 3932874f2c7c4e2c…

MALICIOUS

PDF

71.1 KB Created: 2021-10-01 12:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c3cd895c2715dfb6c4a8f6b65adfd42b SHA-1: bba53051ba914f0e3b5dcb9b4bccfe8067d8feb0 SHA-256: 3932874f2c7c4e2cff85f3d09bb49716572c441ed166a7c3a48927e2293405d7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on potentially malicious domains, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://hugslock.com/app/webroot/img/files/89406747578.pdf In PDF document text
    • http://adec-interiors.net/Uploads/file/tozulivekosujevit.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/lijexabemujosidixojuko.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/numige.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/88734379806.pdfIn PDF document text
    • http://northamericaminingexpo.mininglifeonline.net/file/IIJ39SodYp21kXgt.pdfIn PDF document text
    • https://mcorretajes.cl/upload/file/migibolabamit.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161300c5e82c7c---rosuzelalefofonete.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/42910387295.pdfIn PDF document text
    • http://artdental.hu/editor_up/53377610010.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/xogolen.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/saminadubava.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/132114074569.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/63433573559.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/venoxikisotanilekikag.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/77102066233.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/92167301981.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/wijegokufalomurixarimum.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/84385480037.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/6200274302.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/gunupo.pdfIn PDF document text
    • http://flathead.herosuite.com/userfiles/file/tukemavugejibidagugexor.pdfIn PDF document text
    • https://negaratoto.com/contents/files/rexamatinonuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=hatsune+miku+hatsunePDF 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_off0000b246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB246 10288 bytes
SHA-256: 853eda05b30acf9066e4caee803d519a7714cdc0981784413c37cc9272e901ab
font_01_sfnt_off0000c92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92C 17736 bytes
SHA-256: 584a99e703ef66d30b8f8c83918440a42492c3e3fa392e0eddc67ff9e693a50f
font_02_sfnt_off0000f6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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