Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e18cf49cd016c2…

MALICIOUS

PDF

79.8 KB Created: 2021-09-09 00:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d12cc6733fb5bc43405ecd7a95112218 SHA-1: 59c1c5106fdb87d6c39b05494f41ba91b656fd8e SHA-256: 73e18cf49cd016c20170cbb8f830bc25208162bc3f8f690f3b6d0111c5ca3c7b
126 Risk Score

Malware Insights

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

The sample was identified as malicious by a machine learning classifier and ClamAV, indicating it likely contains malicious content. The PDF contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting, suggesting an attempt to obscure the final destination or distribute malicious links. The presence of these links and the overall detection by security tools points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://tbm-mova.by/images_from_html_editor/file/xuviwazozogun.pdf In PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/xenaxikofisabopevaje.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/3134728087.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/tekozoxow.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/42917439753.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/77237549601.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/javusope.pdfIn PDF document text
    • http://industra.sk/userfiles/file/1871205245.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/73841218737.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/naremoxujiwopezadonojigi.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/vaxazo.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/63236483278.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/rerud.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/43443845597.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/81730720540.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/zarunokerosarodarepebepat.pdfIn PDF document text
    • https://subded.org/userfiles/file/vesapijigulasatutifisun.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132bd4d8c7da---nefitedakukef.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/retaliwisiki.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/99505308833.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/463060425.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/dukozobelivutek.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/62889926188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+change+my+internal+storage+to+sd+cardPDF 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_off0000d42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42C 16920 bytes
SHA-256: 2122bb51a098da17697b55be45a9d1420b7fb156bc69592f792aec0822e31f83
font_01_sfnt_off0000ffe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE6 11008 bytes
SHA-256: 2df1f01d0732e7a77df0d7c03a1649bc98892a01e102c655ebc6f9ce31dc2660
font_02_sfnt_off0001191b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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