Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff2bf02c742dbd8…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 07:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fbf8db3195180624c3e29b0ed112b8f4 SHA-1: be844f4673c30e748c5f5a451325c50395769fbe SHA-256: 3ff2bf02c742dbd8ee5085dd76678f89e82210a43765ecec4a7ce9f6bc206551
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, flagged by ML and ClamAV as malicious. The heuristics indicate it functions as a link farm on disposable hosting, with one URI specifically mentioning 'red alert apk download', suggesting a lure for potentially malicious software. The embedded JavaScript likely facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://philabc.ru/uplcv?utm_term=red+alert+apk+download PDF link annotation
    • http://www.perchegouet.com/ckfinder/userfiles/files/xuwavujufaduk.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16144a9f95219a---58466507914.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/63214178742.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/92275107827.pdfIn PDF document text
    • https://valuekare.com/ckfinder/userfiles/files/70974443997.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/34808545202.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/tabadimajaxedajefes.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/67355539163.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210917_89503.pdfIn PDF document text
    • http://wdnederland.nl/file/nirewobavukozokipex.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/26403585296.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/58652388252.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/32905712302.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/tifeliniretewizekoluxot.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/ravoxupasuf.pdfIn PDF document text
    • https://remini.hu/userfiles/file/lojabekaxirewo.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/93442874026.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/miwunomijawumizetajewewa.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/77528641661.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/bulipuzufazemeguvale.pdfIn PDF document text
    • https://servicio-mexico.com/images/file/43800385490.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/lumike.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_off0000d375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD375 10348 bytes
SHA-256: 4e04cadb38e7922f18875fe341faf6b39cabdf3027dd3385f1b7479b0861c0c6
font_01_sfnt_off0000eafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFC 19896 bytes
SHA-256: 5f417ca37a454a3ad144c0a0f482ec909194d1c9f12e305169163fa044434f4a
font_02_sfnt_off00011f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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