Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f958100d47d8f0b…

MALICIOUS

PDF

90.7 KB Created: 2021-09-18 03:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9fe4c469b59e13adb279c03ed0be0367 SHA-1: 632f84cc9d3e2160422a03e4869d9bd9804e9d88 SHA-256: 7f958100d47d8f0b0558a16642e8fc8092ef69219b0d0356e01cc5c26d768117
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs and is structured as a link farm, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://archism.ru/uplcv?utm_term=spider+rope+hero+online+game PDF link annotation
    • http://raczcsalad.hu/files/mujamolaval.pdfIn PDF document text
    • http://lawngo.net/fckfiles/puxakazalimofez.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/xavewevulutuga.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/womagitelu.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/68568364087.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/betunowosomadix.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/38801213468.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/negalaxatezajef.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210917114717.pdfIn PDF document text
    • http://nawarashop.com/phya/ckfinder/userfiles/files/jopezirolebakemonume.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/vemerukipudukapujil.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109041359141133.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/45617447866.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/33773101482.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/munigemepopevobekaneruvup.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/vutujuxitubekumev.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/10147323382.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/86332727774.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/wixomunibofog.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/96430764236.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/74242088514.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/29607863231.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/zagunalemobelajofebejina.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kuwuti.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/wonositelidimo.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/7818281067.pdfIn PDF document text
    • 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_off0000fc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11474 10648 bytes
SHA-256: 488ce24d1307dbf6c4d9aaf2298fc4d26e0753d809be140d3b403cc42bba9a36
font_02_sfnt_off00012c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4F 18668 bytes
SHA-256: de4b76db00e3b6a74f329cf6b5af7d8909fdb65634962f379ee525f47cc7467c

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