Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e060c0c2ebab7d…

MALICIOUS

PDF

80.7 KB Created: 2021-10-06 15:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5aeb34f32015a68cca56d6b725e9b90d SHA-1: 4bd3874eb22a5965fbc9428bedc92af57692bd9c SHA-256: c4e060c0c2ebab7d972f131a59752574f045be96202ea559a91f4349c3a2b223
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with many pointing to unknown or potentially malicious domains, suggesting it acts as a lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the PDF is designed to host a large number of links, likely for redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://thaiahpa.com/flash/files/wananelafemaxesavilevani.pdf In PDF document text
    • http://rosabaum.de/web/editor/files/72661980385.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/87466379151.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16145d2fd38ddf---duxuvu.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/63318630416.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/fowotofadujimi.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/daxikuxom.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/gurudisokamiwak.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/30513215662.pdfIn PDF document text
    • http://domuran.pl/files/file/81467813541.pdfIn PDF document text
    • http://c-six.it/userfiles/files/84853048544.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/bufevuxuxuwanivamij.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/67211228039.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/tikarikenu.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/1230510565.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/kozafu.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/tuvikolizudoxuk.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/66192124320.pdfIn PDF document text
    • http://bdsductri.com/upload/files/ledejukovivaderolukeb.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021090613371173499.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/92398571638.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/92580768787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=bsc+biotechnology+first+year+booksPDF 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_off0000d4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFF 11012 bytes
SHA-256: 17b7ca5dde46e248087a9d33651b5867d94c610b68a38f215107ec2746314d16
font_02_sfnt_off000106a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A4 17996 bytes
SHA-256: 7657da61d00953a6bbf309f0ca1c223b0825ef4ac97c79b50fec94605079cc32

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