Malicious PDF — malware analysis report

Static analysis result for SHA-256 97937e17b937c17f…

MALICIOUS

PDF

97.7 KB Created: 2021-09-13 11:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 887b6b8a4583c43bd0375fa9ec4af10a SHA-1: 2578088a3f2bb939772ab34ee23b2e0782fee4c7 SHA-256: 97937e17b937c17f2bc314d5d4ae550aea79a96ba1d8047e4dac32df2ae10b3e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to disposable domains and flagged as a link farm, suggests an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aqs-group.it/userfiles/files/22252893798.pdf In PDF document text
    • http://karinameal.ru/imgdish/files/22986692349.pdfIn PDF document text
    • http://jsdarvin.com/files/jikabiritiparogavirubek.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/girepixewazekulebusava.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/81073064751.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/gemupuvi.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139540d4d5e8---52413892536.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/93189472540.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/fuvonomajuwuzibarulafoso.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/xunibijiwetevuzuzafevar.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/18496522813.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/71892537239.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210913_151852.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/mitodesesikowevilegidare.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/31481160496.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/35401946102.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/82527023285.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/77350974995.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/tofezenoxigisoro.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/33710018812.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/98425601877.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/28134220145.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/tadofovatelowajigilab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pokemon+ash+adventure+gba+downloadPDF 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_off0001170d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170D 11088 bytes
SHA-256: 46fb3592dcd740fbf644de386e4f2f178054a4f30dba6db84989752fcb52a423
font_01_sfnt_off0001309b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148AD 18460 bytes
SHA-256: 0c7d4aa25555a82cc6d9ae1384636bbff86b09c04b9657f7bf0cdb60a9d67c95

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