Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8dd1896438defb7…

MALICIOUS

PDF

78.6 KB Created: 2021-09-09 13:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f263a0623ff6c4c55d8f048404ef47c9 SHA-1: e0583c028c17ffcae97f7253bb15ad94b31e9776 SHA-256: c8dd1896438defb72f584bb26bd9efe58bd720ba24c17898a79987eae7368561
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it functions as a link farm on disposable hosting, with a high-risk indicator for password-protected archive lures. This suggests the document is designed to trick users into downloading a password-protected payload, likely to bypass security filters. No scripts were extracted, but the presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://stavebnevyrobky.sk/www/upload/files/48488351601.pdf
    • https://nutricount.cz/UserFiles/File/98897725003.pdf
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/ruwavebesepi.pdf
    • http://nieruchomosci-swidnica.pl/userfiles/file/gazomisotalejukulugu.pdf
    • http://german-ex.com/images/blog/file/87074791219.pdf
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/52838494735.pdf
    • http://mixmarketing.vn/upload/fck/file/57876147357.pdf
    • https://zzwgjx.com/d/files/nurezuxiregugamuralikowa.pdf
    • http://monteconsultants.com/image/upload/File/48661124993.pdf
    • https://paeonia.ch/userfiles/files/20153862892.pdf
    • https://westhygiene.hu/editor_up/41630027750.pdf
    • https://safewatersolutions.in/ckfinder/userfiles/files/61119659091.pdf
    • https://nabil-doukali.com/userfiles/file/85931751452.pdf
    • https://jeanmarcrobion.fr/userfiles/file/xewuzarozuwetukebivuwa.pdf
    • https://chmelo.hu/sites/default/files/file/lejajixerowidasanavux.pdf
    • http://suriyedostlukdernegi.org/image/files/65873391036.pdf
    • http://stefanourso.com/public/userfiles/file/mogij.pdf
    • http://hagithanh.hagigroup.work/data/media/files/65344750011.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16134c4db5f33a---xuvokexukodumawebivo.pdf
    • http://benhvienlaptop.biz/userfiles/file/guzilo.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311390b115f---revawiroxudesojafiwe.pdf
    • http://spbmedaks.ru/sites/default/files/uploads/fogujeju.pdf
    • http://thumpamonpally.com/userfiles/file/81715085935.pdf
    • https://conviviodihera.it/dati/upload/file/47794603465.pdf
    • http://cudicio.it/images/file/woxuze.pdf
    • https://yoimart.com/upload/file/20210907135344.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=find+my+phone+data+recovery
    • 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_off0000cf07.bin
96df084bc45b58919c56b43a07cf3e88f8e6f5b1b9bdc5228e9b3e772c76cec8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF07 17312 bytes
font_01_sfnt_off0000fbe2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE2 16792 bytes
font_02_sfnt_off000113f9.bin
26ed7e65e00388f2ddbe050cdeda57243d5d6e3b1b8f81374fa57cb87788e2fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113F9 10720 bytes

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