Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb19d64b3e839ff6…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 11:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4406a33c8e4e3e1bf94b9e7e2109f36c SHA-1: 6109bfb23dc8398e39e046baee209ba66c5ee5aa SHA-256: eb19d64b3e839ff66569b70b9dfbcee10fdd85fb0282d022e375cbaf889ac81d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the use of link farms on disposable hosting, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://kleinschaden.expert/userfiles/file/11219800922.pdf In PDF document text
    • http://pekingtogo.com/uploads/files/gagafodijaposojalozew.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210903_07C9CCB399D37325.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/dumevasakipatakifaj.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/bobofizatavir.pdfIn PDF document text
    • http://ombs.ru/uploads/files/33208325672.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/80343660353.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/167901325.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/rokobexap.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/55084839295.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/fanusuk.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/wizepubodapi.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/setepukijuw.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/9376960725.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/c28c8bee030ea0c4ba3238cfe962d343/56719698457.pdfIn PDF document text
    • http://jump360.co/upload/files/20210910105857.pdfIn PDF document text
    • http://askort.pl/Upload/file/nupave.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/40119946654.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/17664014146.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/tuwov.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/12946104491.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/5433507914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+lord+of+the+world+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_off0000afca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCA 10116 bytes
SHA-256: f007dc843dff1767f2ddbf46f37c8468f7106fab6d45bfc3969e8f8f998e89d1
font_01_sfnt_off0000c692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC692 18080 bytes
SHA-256: a4c6933b0c881351678d9f04825ae9165a443d1d83719fb1212b85f06e43c392
font_02_sfnt_off0000f580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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