Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5a7c4fdd173018…

MALICIOUS

PDF

86.0 KB Created: 2021-09-15 13:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 59e3f9df138088278100a8d99efdc1ec SHA-1: df037f814e197b7bb9ad61e2de4bcb04f04b9405 SHA-256: ba5a7c4fdd1730185111ded23abb4d9f4e1768c61640fbca11d111ff24a39b59
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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=oppo+reno+4+root PDF link annotation
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16138c370db6ae---veropemizavib.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/bunanozufosenuxo.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/22592132597.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/fefabomirekosiraxafupefuf.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/68104309648.pdfIn PDF document text
    • https://zzhqhi.com/d/files/23629733543.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/dakosajedixuriwakul.pdfIn PDF document text
    • https://casaalu.com/luutru/files/tivuwakukikeg.pdfIn PDF document text
    • https://hiroyoung.com/data/files/69736768846.pdfIn PDF document text
    • https://motecx.com/images/file/99148773284.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/vekexuluwedo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a491441c35---bebizufexilomuvi.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/86935129763.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/guxopadi.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/bebufajipot.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613257d261beb---juxaruner.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/rinapepelomew.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/tisupo.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/dofopusesozikokelumob.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202195153279134.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/72982387203.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/77456614450.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/57007498407.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/57829360903.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_off0000ebd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EF 9880 bytes
SHA-256: 1509e273ac1e1cba43033b2f3a5ac567a995ba26b34580e7c8c299438b39b4df
font_02_sfnt_off000119cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CB 19080 bytes
SHA-256: 698b6579c9d6eef82939e2db509253ba539341e4e431b62e182043032f0b9ed4

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