Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a7a393604f3dd5…

MALICIOUS

PDF

76.2 KB Created: 2021-09-22 22:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8fde8c25e2636feb92298fa0f4aac7c3 SHA-1: de40351d803ef3b5f62a864a8f460aee822a4a3b SHA-256: 49a7a393604f3dd50502b713bb4ce54775baf9c52c9c7d2fd1318f5ef53efe44
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were extracted, the presence of many external links suggests an attempt to redirect the user to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a5c6eb268---60409547822.pdf In PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/92778963902.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/42362043924.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/5935969264.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/jizose.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/dozizigololix.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/32077571094.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/pinemejumiwuwetizagotawa.pdfIn PDF document text
    • http://samtekelektrik.com/files/74594809275.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/77322517777.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614afc0d1836a---94545471795.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/kinitibijuxugebenopababi.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/5013452226.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021092215323073499.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/vujabepazumeloda.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/wagoronosexuwepotukuwumo.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/85690399925.pdfIn PDF document text
    • http://bochkari24.ru/pic/file/rewagawogitolezoxor.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/fubetes.pdfIn PDF document text
    • http://recrute.fr/files/files/49136963790.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210911164311.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/76282365512.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/50147363071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=note+10+lite+drawingPDF 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://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_off0000c76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76B 17232 bytes
SHA-256: f5bbcbb97d90b0bfce38326d9ea4e11d165e5019e9c8a2ff7aebd09b7d91bc97
font_01_sfnt_off0000f3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE7 10492 bytes
SHA-256: 9da67fd3f38ea5aa80923b9578a5c923d49e20f8c7f1449f5082c54ef9eaf5b1

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