Malicious PDF — malware analysis report

Static analysis result for SHA-256 e991377875067532…

MALICIOUS

PDF

68.4 KB Created: 2021-09-26 10:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7db4d7da7d0b5cd3abc1ddaffdfbcc5e SHA-1: e57bdbbf28a45ab88e14bbb79ead542b986665ba SHA-256: e99137787506753214c9b975f3b890b725a9703f0d8340c50d79719c68d997ad
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://garglob.ru/uplcv?utm_term=beats+control+android PDF link annotation
    • https://cancelaria.pl/galeria/file/50808126445.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/89954596142.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/45903168399.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/36058566026.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/12893621188.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/gibefuriji.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/disebakixe.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/86737764521.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/38855258743.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/7262956860.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/60822838967.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/fekevagafe.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/32053918281.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///84685307116.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210904211606.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/66411031108.pdfIn PDF document text
    • https://novsport.com/content/File/59041110136.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1630965111uQDV.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/xexuzi.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/94261511527.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/xavovuxikunaw.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_off0000ae6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6E 10416 bytes
SHA-256: 16dd74101433277a408741f70341b59fa9e98a45c5be33308e9119980d8d21ed
font_01_sfnt_off0000c625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE37 15212 bytes
SHA-256: 057109cbb167983a51f054b9471dcd8156c7d84564a6486dc810a353c9de9edc

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