Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c7913444ad22b5…

MALICIOUS

PDF

80.7 KB Created: 2021-09-11 22:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a6317e5e2a85ef1b963765b2ff20782 SHA-1: 68b86cc89023c53ca44c477c84865c4de7d890ba SHA-256: b0c7913444ad22b53817f3324ff24202d2fce156b805c58ccbbfb6e8d47601ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high number of distinct, potentially disposable hosts. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wanyuantemple.tw/userfiles/file/4413915039.pdf In PDF document text
    • https://andhimazhai.com/images/files/bebijonemagawalisuvi.pdfIn PDF document text
    • https://phukienbep.net/media/files/lujirizananagaguziziso.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/48957763418.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/fetezojo.pdfIn PDF document text
    • http://xycrusher.com/d/files/vixilubepikunixamipalek.pdfIn PDF document text
    • http://someteme.com/archivos/_20210908000948.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/xotesekulufawurid.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/84953946534.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/miwuniwibiroxiva.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/97138518031.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/35e61916d6c851140d38138ae4ff4fe4/muvofubapolase.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109111755288203.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/kikidora.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/54087555040.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/65534296049.pdfIn PDF document text
    • http://z500.si/files/lijidisesadulukiluk.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/77498631303.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109091545542829.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/28405be9a60e1cd76f83de56774c03c1/gobojafoxiv.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/lavunogatepemuteseja.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/88398922734.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/zisufariwafisijozufam.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/mojolel.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/delotamudeladamekiwemenez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=petit+prince+pdf+englishPDF 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_off0000d44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44F 18764 bytes
SHA-256: d1ab3d7aa3cef7f4d2aac4272dd240013a8c397f49143b081e51446e8c1fe65c
font_01_sfnt_off0001050a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D21 10620 bytes
SHA-256: fc4d6656bf578e68818a63babb4a63ae23732de83dfac3d03098251d9ef9c27d

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