Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf26c95d023c0346…

MALICIOUS

PDF

80.5 KB Created: 2021-10-08 09:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf5c278c5101ddf80d2b49d707279ce9 SHA-1: 69d3996f4f7e33bce94e45f18deb7fac26324b15 SHA-256: cf26c95d023c0346153c088f6decd51a7ce78ec9773b3be62ef1cfdf5b87d3e3
126 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, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external PDF files hosted on various domains. The presence of numerous unknown URLs suggests a broad attempt to distribute malicious content or phish for information.

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://sanalights.com/admin/admin/uploadfiles/file/14821775070.pdf
    • http://mylivediamondinventory.com/uploads/files/16833750265.pdf
    • https://labelmarket.pl/data/file/29574864153.pdf
    • http://maivietnamesecotati.com/uploads/files/69734111207.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-9-23/20210923194632844775.pdf
    • http://ride-on-earth.com/images/blog/file/xezubu.pdf
    • http://immobilieninvestors.de/userfiles/file/raravo.pdf
    • http://srtprogetti.eu/userfiles/files/78722018801.pdf
    • http://bukharasuwanee.com/sites/default/files/file/3534467079.pdf
    • http://zeguvietnam.com/uploads/ckfinder/files/75000455109.pdf
    • http://ty-universe.com/image/files/20210920_094622.pdf
    • http://greenlivinggarden.com/htdocs/UserFiles/file/sukase.pdf
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/pibedugejigabutuxedasik.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614edd224798d---6269538664.pdf
    • https://sintasyapi.com/img/userfiles/file/84647872684.pdf
    • https://gmt-tw.com/app/webroot/userfiles/files/73361064952.pdf
    • https://burkina-businessschool.com/business_school/uploads/file/xegaxijuwalowogubujavutep.pdf
    • http://pphu-joanna.pl/fckpliki/file/raxaloketipok.pdf
    • https://riminabda.sk/userfiles/file/4509925942.pdf
    • https://alves.bg/ckfinder/userfiles/files/52717572548.pdf
    • https://libertyrealestate.in/ckfinder/userfiles/files/nodevogixifetup.pdf
    • https://www.aaptuk.org/ckfinder/userfiles/files/40761115774.pdf
    • http://girisimcilikproje.com/resimler/files/22772467033.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=weighted+average+term+to+maturity
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d40b.bin
4115f5390a1d467505a9c1502634808665445152de5f6be8702701f120c48db4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD40B 18376 bytes
font_01_sfnt_off000103d5.bin
8a80a292bcc6be504286abe0bce9d59db4758b38640b3acf8ec2052c2e8be0d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D5 10652 bytes
font_02_sfnt_off00011c13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C13 16792 bytes

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