Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9b8f6561c75b6b…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 12:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae5433f0d5bc1c0a7eacc1278a93b71a SHA-1: 940e43093100a03a75f2b0a6b29ecd7af7775632 SHA-256: 5c9b8f6561c75b6bd3378e2f223f58ce3ec4282898c5b748fe76dbda669754ec
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is designed to link to many disposable hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://sarkar.ie/userfiles/file/16100138829.pdf In PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0911/23ee7acc5831410778efb1d7a8815fdf.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/56610353258.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///suvimotabomofubexid.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/28558060975.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/fiduzok.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/5403555707.pdfIn PDF document text
    • http://matras-devison.com/upload/file/puwixiguvasezukopede.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/74854418248.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/zopidaxasefopibijofubisef.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/doropesamomukosu.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/nagibitafiwopafabiwones.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/23354267398.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/wanoru.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/kowagovabunatapet.pdfIn PDF document text
    • https://baptistfriends.org/media/83294169721.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/6135201362.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613da891afaf3---17598235602.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/42888691866.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/73001338699.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/161317b65c4c05---xisosawi.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/tusameweb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=android+tv+wallpaperPDF 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_off0000d799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD799 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB0 10348 bytes
SHA-256: b8a0603dfa7e315371791c3bd8d24d05f46a14c9916604ab4c4803240c620086
font_02_sfnt_off0001072f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072F 18252 bytes
SHA-256: 68d9da21a7b47b2051178a9f9ff5d8e2c5df2395bd846118775b2cba1d5c1db9

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