Malicious PDF — malware analysis report

Static analysis result for SHA-256 d832d6c8104f621c…

MALICIOUS

PDF

85.2 KB Created: 2021-09-20 02:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6257fc8e209b1c0ab99e8e18f46261a1 SHA-1: bbe6755a77c4998eb51ab39a5646a0a2cd5332d4 SHA-256: d832d6c8104f621cd1f12b459e843f29ee3c1e093c22e0abeeb46eb2f907e0fd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The sample's structure and the presence of many distinct, low-link-count domains suggest a campaign to distribute malicious content or redirect users to scam pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://alkanboya.com/files/file///vokox.pdf In PDF document text
    • http://skolky.info/foto/images/file/dumesolipisavap.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/kiwozak.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/54286391942.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210902_115356.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/68579566976.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/33564543902.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/83714710794.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/fozejewaxu.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/163079056817059125069.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/rajalidomupikeni.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/25252220183.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/fonozotakojogilegexijog.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/vidomo.pdfIn PDF document text
    • http://8njl.com/userfiles/files/sibas.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/72776421665.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/bugizizinoluvaguwem.pdfIn PDF document text
    • http://foodchemsino.com/d/files/27133729197.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/96208172083.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/1613309885.pdfIn PDF document text
    • https://alutat.com/data/file/wepup.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/18233769934.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f54375e160---gevobu.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/faduxufawovajizuzasixitu.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/libemuvepiluzirusavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=android+share+wifi+connectionPDF 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_off0000dc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4E 23000 bytes
SHA-256: c94210b7d1c49573ef9b45751c8ea8d1a9d58b98cb380f790e46af6f31b1c4a3
font_01_sfnt_off000116c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE0 10596 bytes
SHA-256: 76418a2111eca8f2f7f072a2c5d314c476eb5286cdbe2ac7ffb3f46d390a1623

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