Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c47bfc405f0dd01…

MALICIOUS

PDF

87.7 KB Created: 2021-04-08 08:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0e159caee59c13174283de9fd0d774c SHA-1: 7804b8cf53f47221e4d2ea4a370defaa0213978b SHA-256: 5c47bfc405f0dd0175e184a9e7d457f87f23f5ee652c08a396178b91ebe30b48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, a technique often used to redirect users to malicious websites for phishing or to download further malware. The heuristic PDF_SEO_LINK_FARM specifically indicates a large number of external links, suggesting a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier further support the malicious nature of the file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=homedics+cool+mist+humidifier+filter
    • http://finuxezanasa.mygamesonline.org/brushless_alternator_seminar.pdf
    • https://cdn-cms.f-static.net/uploads/4375702/normal_60483a7eda214.pdf
    • https://gibegijatu.weebly.com/uploads/1/3/5/4/135400332/solopotufepezosi.pdf
    • https://cdn-cms.f-static.net/uploads/4405193/normal_6019f1e62a293.pdf
    • https://static.s123-cdn-static.com/uploads/4418963/normal_5ffea87adf043.pdf
    • http://wumomotetidofe.getenjoyment.net/amplificateur_oprationnel_soustracteur.pdf
    • https://bipinudaw.weebly.com/uploads/1/3/4/7/134718108/mepodufinarozib_zakopejufug_vunikuwowopa_wedevotak.pdf
    • https://fufiwixafuwisu.weebly.com/uploads/1/3/4/7/134770326/71fd3dca84.pdf
    • https://static.s123-cdn-static.com/uploads/4417138/normal_5fe554e36c302.pdf
    • http://siwupezomejen.getenjoyment.net/40290278445.pdf
    • https://cdn-cms.f-static.net/uploads/4446398/normal_5fd76b783e144.pdf
    • https://cdn-cms.f-static.net/uploads/4468296/normal_601f6f9a1ee87.pdf
    • https://cdn-cms.f-static.net/uploads/4369174/normal_6027272f88f0d.pdf
    • https://kasasifu.weebly.com/uploads/1/3/4/6/134697732/368bf83ee086e.pdf
    • http://viwafuxofiseko.getenjoyment.net/pemeriksaan_penunjang_psoriasis_vulgaris.pdf
    • https://cdn-cms.f-static.net/uploads/4450723/normal_600a1389eceed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_26b2c0bb3b7a483f8a75dbd378b1f80a.pdf?index=true
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_45e4867c279d4ca4ad7d64c32fa5cd13.pdf?index=true
    • http://torejejowomu.myartsonline.com/john_deere_js30_carburetor_removal.pdf
    • http://xunudijumo.myartsonline.com/95466883826.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115a5.bin
8d97220550a7c144a6130c4d56de7d848f925bde9c2a6e59c6bcb81e3ccdc862		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115A5 5012 bytes
font_01_sfnt_off00012685.bin
3acbc5731ce629a4433c6878324d28270cead3c2ba4a504b5d89b815e94913c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12685 12428 bytes

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