Malicious PDF — malware analysis report

Static analysis result for SHA-256 917832704f7080e9…

MALICIOUS

PDF

69.5 KB Created: 2021-09-17 16:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6e81d305d982dd1caf71cc9e36ade43e SHA-1: be45447917c74e49d6835c76ec871bd608b4d0ed SHA-256: 917832704f7080e9789736478c465720338081b8241ec5fe7fce494dfb6b0043
146 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Several external URIs were extracted, including one pointing to a raw IP address, suggesting an attempt to redirect users to potentially malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://napraforgohotel.hu/upload/file/nukuxewezetegodezaxadi.pdf In PDF document text
    • http://naturalwonders.com/uploads/files/dokisowilezo.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/65926576711.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/37494815552.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/sinon.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/xozaziwusugitovexegomo.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/widuj.pdfIn PDF document text
    • http://aven.su/userfiles/file/nuguxuz.pdfIn PDF document text
    • https://viceda.com/userfiles/file/zuvunaxi.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/28177460753.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/gowotadef.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/letakutexewug.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/najamiriwefekaxuzibo.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/81710912713.pdfPDF link annotation
    • http://parquet-cortes.fr/data/Files/fawolo.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/19616002046.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/refalawetukidowub.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/88046803468.pdfIn PDF document text
    • http://slovoveri.org/userfiles/609238291.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/72139520343.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/mifojivilinuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=naruto+ultimate+ninja+impact+ppsspp+free+downloadPDF 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_off0000afef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEF 11076 bytes
SHA-256: abef7fb70fdb6786b472ff018cc3c5e361e2ff726fa24beb36d12ab172ad6a20
font_01_sfnt_off0000c9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B9 15176 bytes
SHA-256: 987a71d7d1f43daed8025e1929170d7ce369d1de5507ab4b9b03898f7d059e30
font_02_sfnt_off0000f003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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