Malicious PDF — malware analysis report

Static analysis result for SHA-256 78098274aed1d33b…

MALICIOUS

PDF

89.3 KB Created: 2021-09-14 02:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: c154ccac8b47adad46a91a9ef2fff8c3 SHA-1: c14adc7e7863d4003128236fc31a519225475fe8 SHA-256: 78098274aed1d33bd9eaf4cf5bcd95cf2f2b32e6c7406ad89ce97b4599a7837e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the overall structure point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://commonlawhouse.in/userfiles/file/38840892084.pdf In PDF document text
    • https://serrechevalier-skifun.com/imagesfile/2465983092.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/zuzumapa.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/30633749550.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/99913720361.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/loganetanik.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/tazevopigurinofudi.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/82836994050.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///99221485311.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/68573766241.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/84784022363.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/bejufagifusoxalogajeg.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/jiguwegivizinavelivek.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/76830047321.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/69177302581.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/97058843836.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/96268162130.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/67760710892.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/sufipofogukinupewefux.pdfIn PDF document text
    • http://etkenkalip.com/files/3119227491.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/numusumalabedibizib.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/20813751081.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/moliwatogivepeluzoxa.pdfIn PDF document text
    • http://live-net.it/file/12666909135.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/18587327912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=photo+editing+app+for+windows+7+32+bitPDF 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_off0000f536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 11300 bytes
SHA-256: 36356d0c70621464c287df0557d9faa9338d5cffc06580aee8bac6b7aafc9646
font_01_sfnt_off00010f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7B 18496 bytes
SHA-256: 507b457d2a2e542824540dd658443a47eb0100cd8b20c5cc836b8679349e6bd4
font_02_sfnt_off00013f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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