Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c222a95201681f9…

MALICIOUS

PDF

77.3 KB Created: 2021-09-13 03:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd26c1337875635f18c3121bfdb92272 SHA-1: 4ef1facb8f603e23918b302e179cf6e0aadaf25f SHA-256: 3c222a95201681f9b83513fe8230f7fff345e91d9d97a1eaaddda1c6e164e5f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.pirkitpadangas.lt/ckfinder/userfiles/files/67731680887.pdf In PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/4634922719.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/44131668265.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/11897291485.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/mojozimokinopefare.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/zetajeluwabukunomikibir.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/61474581779.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/poxan.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/mofiletelejalume.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/lupubudiwov.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/jixiliwase.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/3866275992.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/rafuki.pdfIn PDF document text
    • https://tavio.ru/files/file/34064510222.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/talajegosoxujusanewevet.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/20535183440.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/notebapumigeri.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/41244988673.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/7593679121.pdfIn PDF document text
    • http://synergyproperty.com/images/files/59880348681.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-8/20210908201317745964.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/70153065022.pdfIn PDF document text
    • http://apsons.eu/files/file/witugilogabifamuraf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+get+the+double+pistols+in+warzonePDF 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_off0000ca24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA24 17104 bytes
SHA-256: 1e1ea01b13d57c58f9e2f2258a4c382bc9ae00afb6f5666d6b138076b17910ce
font_01_sfnt_off0000f5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BF 11048 bytes
SHA-256: 8f09e01e78b56905fe353204e6170fd73e6d16110ba4791c1a4edcb78a58db63
font_02_sfnt_off00010efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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