Malicious PDF — malware analysis report

Static analysis result for SHA-256 77dca985de0744e9…

MALICIOUS

PDF

79.1 KB Created: 2021-09-09 04:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6f3d149d52419b9ebb5d08442a347b29 SHA-1: b6021afa6cb877e5e1f944c5b0a8cfeb611b594c SHA-256: 77dca985de0744e988ee83e454f506b9994f9ee46f39c66a523b1682d3f48521
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 0.9958

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://krisoc.ru/uplcv?utm_term=vivacut+pro+apk PDF link annotation
    • http://daydreamspin.com/userfiles/file/50650144780.pdfIn PDF document text
    • https://penal-garazh.ru/files/panejipele.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/88546904526.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/34754947186.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/63449203199.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/66586711939.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///61467194579.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/43833532548.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/bukogarux.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/goruridenusojum.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/bejeranunujupitemata.pdfIn PDF document text
    • http://newmob.it/userfiles/files/2721815750.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/52936944535.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/8950334793.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/47593714.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/niwemupozapowirelesafivuf.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/70555587400.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132bf4d221f7---zazunujoripajafetepez.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f6b1750d6---99527904565.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613958fe880bc---safat.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/79198577082.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/46549927892.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/najisotixuxuminone.pdfIn PDF document text
    • 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_off0000d3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE5 17432 bytes
SHA-256: e4a1b38adaa7d18989970e3293104ed2566f3b3d07aecc119bf199e07ad18532
font_02_sfnt_off000118c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C0 10144 bytes
SHA-256: a2c8542a4665f7eebd5f0efa24b5269ff367c02d25c61576d897ab0ab1f0606a

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