Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a750682f12d3ca3…

MALICIOUS

PDF

79.7 KB Created: 2021-09-14 02:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ed6991f124e518b8242005e241b37017 SHA-1: 6e78fb0d50ef8ba9a2dc35f0c4f7f8728c2c0049 SHA-256: 9a750682f12d3ca39afface3204b82f708e3e0ac0a9ad5b86cbc882c7f746f5e
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with a specific heuristic flagging it as a link farm on disposable hosting. This suggests the primary purpose is to redirect users to potentially harmful content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://studiopros.com/userfiles/file/ In PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/70323556863.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/85356778036.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021914648153410.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/xaselorarozutopokuwived.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/fipogadubalidofetas.pdfIn PDF document text
    • http://kustari.net/userfiles/file/1173094253.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/35059826968.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/93312296435.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/levaguji.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/guwiwovotozete.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/dagijesopowovizodirikijog.pdfIn PDF document text
    • http://inistor.com/ufiles/files/76145178142.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/11825077592.pdfIn PDF document text
    • https://nyig.com/files/file/49360900811.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/66717846876.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/60045732911.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/wivokosolaverululupu.pdfIn PDF document text
    • https://ms02bet.com/contents/files/802889329.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/petexekiletuluzir.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vajavolitunipelefikon.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366fc2dc6bb---18850962840.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/zarog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=fascinating+womanhood+for+the+timeless+woman+pdfPDF 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_off0000d3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 11132 bytes
SHA-256: 9c93311f27071a2ffda456113a0118404726b6f50e7ed5fc30608ae2278a31d7
font_02_sfnt_off00010586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10586 16672 bytes
SHA-256: 32233d3195e9ddaa1e62ca9685c27bd7bae04d0fcbba4591990af35341a768ad

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