Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61ec8824b6c6242…

MALICIOUS

PDF

85.3 KB Created: 2021-09-19 04:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 49347a8bbe4726b118d1295b2b136a17 SHA-1: 74ffd7f409506d75eb7495e76269d268d69a3809 SHA-256: a61ec8824b6c62420cc89f90e22045b65aedccc492d02f6bc1a1947e0ea5669d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://infrive.ru/uplcv?utm_term=arthur+c+clarke+the+sentinel+pdf PDF link annotation
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16135925aab729---9432098883.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/firiratubewikanuwumikav.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/nuxerosodaminupevuwavosu.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/13306369243.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/8486930595.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/89657750924.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/rezibagidobemexidaneriwa.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/31674535704.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/27868191605.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/taxirirag.pdfIn PDF document text
    • http://word.mn/uploads/assets/77673272624.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/rirofasijomaxinaxos.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/58320033941.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/14057108335.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/6514551386.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/17317313559.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/90784856421.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/65625690369.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/zerimolutad.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/jodepiromimu.pdfIn PDF document text
    • http://apcmagon.com/userfiles/serodiriwagibome.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/fodaduxumon.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/80398834595.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/69268852243.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/jufinukozeliki.pdfIn PDF document text
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/95646163630.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_off0000e751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE751 10772 bytes
SHA-256: e1512e4579c8bdcea0e04901d217385a90492d5afd706b72f95c8e4a12feb3b8
font_01_sfnt_off00010010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10010 17992 bytes
SHA-256: 22b761db65bc60d0cb7685a7a4f130e4aa49a1faa1639c89481a48d5fa2d8a50
font_02_sfnt_off00012f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1