Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8d7366624d8032…

MALICIOUS

PDF

76.7 KB Created: 2021-09-09 01:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 1ec3f8b0582a8b05c934331cc4767eb7 SHA-1: cdb7bbaa934233e543605010282cad92779e565d SHA-256: 8e8d7366624d80328cc51a4fe19e22d831910183f86ad3bff3cf7aff182810e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://f27szerviz.hu/upload/files/67716383943.pdf In PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/wusemapesur.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/24074210559.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/xebojinudumemudosula.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/78519664339.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/suzavozezipudutilimidu.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202198_13513_500.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/87734442660.pdfIn PDF document text
    • http://weingut-suppan.at/files/fovupevodikiwaxorim.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/85222255921.pdfIn PDF document text
    • https://citytrafik.nu/images/file/74949138802.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/tenomebekorexewexuti.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/suwetojose.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/movidowavi.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/bexuruxodajifib.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/39962549911.pdfIn PDF document text
    • http://boldogelet.hu/media/wudev.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/tovut.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/21643336882.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/belobugimuxopumilitone.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/wubin.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/29010249098.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/feradiridaninilesawulupum.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/zekelawukukob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=can+you+transfer+text+messages+from+android+to+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_off0000c654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC654 17648 bytes
SHA-256: 765054f733b1be2710da5878f458aba45f5474935275ce3a4ebd4d5b7ce1edc4
font_01_sfnt_off0000f370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF370 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B87 11000 bytes
SHA-256: 58699159e783a476fbe6489815f60a30fcf27532e1c45b4fafd1a5627e9c2bad

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