Malicious PDF — malware analysis report

Static analysis result for SHA-256 37553d0d95dd321f…

MALICIOUS

PDF

70.1 KB Created: 2021-09-14 18:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e3fd17a14bb8b56f65b9f50b11dd07e6 SHA-1: 13859fdc4d4ab5facb2d2c798e5007c951bc1f1c SHA-256: 37553d0d95dd321febdf4db88f67e988754f44db8c11b6f20a1e3e4d584fd751
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple embedded URLs point to potentially malicious or unknown domains, suggesting an attempt to redirect users to phishing or malware hosting sites. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly supports a malicious intent related to web redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://hoya-system.com/uploads/files/202109041211582059.pdf In PDF document text
    • https://guruvinodji.com/Userfiles/file/xakujenij.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/bukasam.pdfIn PDF document text
    • http://vhshf.de/File/mesikatosuf.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/zawekugonopagurovokukew.pdfIn PDF document text
    • https://kiptep.ru/file/43764317980.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/43207618073.pdfIn PDF document text
    • http://rentaruedas.com/files/others/28285890239.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/56492807998.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/84845992220.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/pilox.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/8894301599.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/pivorot.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/rapesakexeratu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130783ed3ff0---78806664644.pdfIn PDF document text
    • https://slide-bearing.com/d/files/59904387604.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/gexenarolebokuderun.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/50882662674.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/84545419546.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/mafazudakunemo.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613143dc1ff7c---40219811031.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/60022767211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=comet+tempel+1PDF 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_off0000b39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39C 16304 bytes
SHA-256: 50ddb8ede38ec57cae2a4307a3eeb0197a13c85a9def6f6e6dc1828d4c399429
font_01_sfnt_off0000dd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59B 9872 bytes
SHA-256: 057ea1739e6de655a18ce8a56159e38d8c9a5db5106fe96122eb1699deb41cce

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