Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5367b78a3620653…

MALICIOUS

PDF

69.8 KB Created: 2021-10-01 15:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 388a6227601007aa1f4affff6933c848 SHA-1: ea35fba77ab7b06e256c3690dc16ec299090ee0a SHA-256: c5367b78a36206539806dbd89d0fe6f4c82ff502ce3f23925ded2ccfcc251fb1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The numerous external URIs, many pointing to disposable domains, suggest a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=backmasking+app+android PDF link annotation
    • http://dobermanncz.eu/files/nedenoduwujixonoma.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/bokonupazopagovupu.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/4158194391.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/gowunulerudawaxorubagaj.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/67495943314.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/xifebaburuduzexupemad.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/deruno.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/28107495473.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/nejag.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/fujanaxo.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/vasabikobafoxujus.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb87563c08---foviv.pdfIn PDF document text
    • http://grupophi.es/uploads/files/13369774244.pdfIn PDF document text
    • https://j26clean.com/upload/files/depedi.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161492dd4520c5---dazobefag.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/35865355619.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/34190105766.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/35615854278.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/widex.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/bekebeduranuj.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/97169994276.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/roporatojupepikud.pdfIn PDF document text
    • http://iveducentar.com/uploads/assets/file/87756055953.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/mogikivafudefi.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_off0000af9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B1 10724 bytes
SHA-256: 72e58c74e7f684004ef4b6a03cb3881a1a7103e0f17b6b49286fa764d41a3177
font_02_sfnt_off0000e017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE017 16848 bytes
SHA-256: ebe98f55a966389dc8d28660e18f8c5b19e0766b0a772ee50be9883e39b37109

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