Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d570c2eef95f0de…

MALICIOUS

PDF

91.0 KB Created: 2021-09-20 16:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aa4061cb5dc727cb4815c9877cddafbe SHA-1: e332efc6bfab4ee64bf3eca97fe98f83b0e19adf SHA-256: 9d570c2eef95f0ded4bb23c9cdae4291ec1f23f65a459566a604d70ea7f61f4c
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. This suggests the document's primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 5

  • 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.
  • 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://falerisztika.hu/tmp/84641571984.pdf In PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/gejivuwivilidabubume.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/xerid.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/55533255612.pdfIn PDF document text
    • http://rurisnet.org/images/file/51526263560.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/letozameri.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/66777933230.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/subuvotijosuja.pdfIn PDF document text
    • http://health-bridge.in/upload/file/18230041054.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/divadovuroxomada.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/58132962773.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///nabaxarefudusi.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/9999303024.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/sidoropopanibesoje.pdfIn PDF document text
    • https://motecx.com/images/file/xeluvif.pdfIn PDF document text
    • https://tsegypt.com/file/7260807385.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/kifokulofugada.pdfIn PDF document text
    • http://cl-pub.com/files/files/rumisetexapugemuwa.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/febevuborasiro.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/78321163506.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/77278852078.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/pixozolisorefetej.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/60817886052.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/xuzopuronelatutisudan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=babbel+spanish+app+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_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 10584 bytes
SHA-256: d049027aa0b0eb52e9869a98bd036a1e7dfab9742aa4e1d96f119cd13426a6af
font_01_sfnt_off00010f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001276f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276F 21056 bytes
SHA-256: 68c77322f4ac36029f922575e2e02d9858420c6ac53436b8093216849add9df5

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