Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b472bf61a3b8401…

MALICIOUS

PDF

90.3 KB Created: 2021-09-17 08:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8fc22d65894066673f9ff26bdb7e1857 SHA-1: 48302a5a3fd121f730547ba6c6f344eb51c41a07 SHA-256: 3b472bf61a3b8401768cf194d1e68dc0886b3420d79e8004fc6efbf726734066
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The sample's primary function appears to be redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://nsaimmigration.com/userfiles/file/74283142567.pdf In PDF document text
    • http://voijin.com/userfiles/files/9272569650.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/kuvodusidoz.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109080838219865.pdfIn PDF document text
    • http://proart.by/media/file/38180013620.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210903211951.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/63559433348.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/pixuzepomusunidadeb.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/dujifabajutaj.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/35773217692.pdfIn PDF document text
    • https://capecoralliving.com/media/file/52274166625.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/verumejufeb.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/katomit.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed8b232d7c---visinupanifeluxodenufena.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/ritulumuvurelumefuluxedo.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/waranano.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/fokudemisisuluzulim.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/11141439719.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410f5787af5---zefawinozuja.pdfIn PDF document text
    • https://hiroyoung.com/data/files/87951284920.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/sizavewolobetem.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/rovekasujemomo.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/51614677373.pdfIn PDF document text
    • http://apple888.vn/luutru/files/26884244593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+death+of+the+author+barthes+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_off0000fab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB3 19044 bytes
SHA-256: 74ce9aa9c8d485c8bea6540ccadbeb327aa45ebfe98fb67103b169e2e570e397
font_01_sfnt_off00012be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE3 10556 bytes
SHA-256: 894a961f9e742973abde1cf763c4c15bf95010a4dcfefe172f69a407875c3062
font_02_sfnt_off000143de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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