Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2105b9d8d103be…

MALICIOUS

PDF

78.9 KB Created: 2021-09-09 10:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 626646b89afc71b473f735b574a06dc7 SHA-1: 63d843e88eefa56b0854b3e2283e5160bfab6f47 SHA-256: 7f2105b9d8d103beda54fb07944d970b24a6a374a4445b6a387e452641d7c32a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. ClamAV and ML classifiers identify it as malicious, specifically a phishing trojan. While no scripts were directly extracted, the structure and URL patterns suggest it's intended to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/tetabimexeji.pdf In PDF document text
    • http://progfin.pl/userfiles/file/17905613123.pdfIn PDF document text
    • https://edarky.net/data/file/nojog.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/53826144014.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/toluzovokavokisoguritire.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/11129197229.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/99798347179.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/orafepixajedoz.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/guzirutori.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/62510263611.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/18222142595.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109031049299671.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/03/file/38486008006.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/sugamuzojemigemef.pdfIn PDF document text
    • https://limsurempat.com/contents/files/28228441588.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109060928339811.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/81720047016.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/47608266908.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ea4fcf0f2---tesubuxedipizedaxif.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/94462119792.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/41944912781.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/73873092762.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/jetudatutopunusuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=daily+news+apkPDF 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_off0000cfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD8 18172 bytes
SHA-256: 93e73b51f2b12a7178fb06cb947c965095147db46fbe56a81a4309efa6faf613
font_01_sfnt_off0000ff2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11744 10220 bytes
SHA-256: 1190034bb7ad4757b17bc2d8fe6aecbbefcb5c270524c88be1003c3cb99e8723

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