Malicious PDF — malware analysis report

Static analysis result for SHA-256 e945f87952764dae…

MALICIOUS

PDF

68.2 KB Created: 2021-09-08 13:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d6b1b41295989e4c123dd6304c6374b8 SHA-1: 2121f71875aea5786813da5328d4e60d0c799f88 SHA-256: e945f87952764dae9ff0f26e5a0737b2a76c84ee2bfde7ba046555f27ef9100c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://polyacer-ecp.com/userfiles/files/20210902_182017.pdf In PDF document text
    • http://apsons.eu/files/file/gogifile.pdfIn PDF document text
    • http://araonline.hu/uploads/file/winarosopovutedafamemo.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/68930759589.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdd59f1bba---20431183082.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/gigized.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/81119913540.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/83031137055.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/71108512200.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/77086618499.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138195c7e499---jumakudoroboxipixowevob.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/sikufinafebojejelel.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/13919977961.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/18740898217.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/zubojipogunez.pdfIn PDF document text
    • http://taociren.com/upload/file/210908000247915752ya13w5x96tal.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/turidodaverixujosokof.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/piradofojipadugaludo.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/kokusosonezo.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/77831898454.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/labokizuvinagudasutukuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=bin+card+and+store+ledger+pdfPDF 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_off0000adc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADC4 14684 bytes
SHA-256: d0ccae105570546fde03425ef6eb110695b07fea053e5f27551a0bb535470bce
font_01_sfnt_off0000d29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB2 10848 bytes
SHA-256: 923097895b96483293ba7c4a30fc3c9a1ada9d3ae0a55757f8be48b65b690ebe

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