Malicious PDF — malware analysis report

Static analysis result for SHA-256 96137325851c45f8…

MALICIOUS

PDF

77.9 KB Created: 2021-09-17 03:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 829ba9793209c4a8ba14c308c2969a70 SHA-1: 361008cf48d63a78edfd2cbf577e1df2a1eccb08 SHA-256: 96137325851c45f8bde8ba34a09c254f7196a677b41e815d5af84e6a3ff0d494
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. Several heuristics indicate the presence of external URIs, including one pointing to a raw IP address, and a 'link farm' characteristic, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://pistant.ru/uplcv?utm_term=extreme+car+driving+simulator+2020+the+car+game+mod+apk PDF link annotation
    • http://color-gateway.com/userfiles/file/seporolukusazinavenufef.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/tonobupimavelezisudolu.pdfIn PDF document text
    • http://proxima-online.it/public/file/40684072989.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/13198739742.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/62091882767.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/vozubodupasi.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613a06aa0e7ac---47647868346.pdfPDF link annotation
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/ponuloxofazavurupuf.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/62600494659.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/35337107222.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/ditepevasadiwoxis.pdfIn PDF document text
    • http://strandedtattoo.com/file/jaloxubib.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/53745068057.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132107f4f7d9---83316260463.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/xudamopejine.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/wozovetusuwoxunogilig.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/pesozeboxujobajidaxu.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/61278427120.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/23370410662.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/51728976675.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/guzofebubetawolobijitonas.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161390a2760ef4---91957429777.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/loxaxejisi.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/56844821480.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/wafedudiki.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210904_EB23A83607FC3584.pdfIn PDF document text
    • 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_off0000cb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3C 11548 bytes
SHA-256: 6fd054bd6038ee46571c0285ffa7d7330f0daceec69e74647eff06f71725561d
font_01_sfnt_off0000e64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE61 16852 bytes
SHA-256: c3823a0c89786a8a567a726677add02401c95b366e71b7633ec6bbda9796acbd

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