Malicious PDF — malware analysis report

Static analysis result for SHA-256 2994a7a8662c29bc…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 10:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 95d247d2df60a8c3a29d15f6136f00b5 SHA-1: 6acb9a638d0ca41c27aec8c05d6f90c5aefb53e1 SHA-256: 2994a7a8662c29bcc732dd2304168ce65741fc66d064eabf9613124b73cf4e6b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of JavaScript suggests an attempt to execute code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=how+to+get+info+from+android+to+iphone PDF link annotation
    • https://sgcaregiver.org/contents/files/dedinefufirel.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/82932714022.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/88667923061.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/71622067737.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/85371319198.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161329c034beb1---46340875224.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/disolurapadaxokas.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/bizebunesovesu.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/84534586805.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/dexinefeme.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/xigavukiluketifa.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/70683733357.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/71192515562.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/wulidajoguvigizoda.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d4d047ff---jumodipiwifek.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/zimeku.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/vetixolanutetixaguximon.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/wusexuxomedifal.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/dudoxanafoveb.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/79395323333.pdfIn PDF document text
    • http://rapet.hu/files/ropetadapazixomugikewupuz.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/depegeriranemiv.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/4725952002.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_off0000d981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD981 10808 bytes
SHA-256: af7400b02857fe3a155b56142eb742c06c8a5e9c157fefe1da8a43fc394d5137
font_01_sfnt_off0000f1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FB 17192 bytes
SHA-256: b9e39d6d4a7ff31c8c520ea3ffc3e9743a941bd7414dcde7c2102f3e48ecefb6
font_02_sfnt_off00011e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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