Malicious PDF — malware analysis report

Static analysis result for SHA-256 147be5bc206ceb91…

MALICIOUS

PDF

69.5 KB Created: 2021-09-24 23:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6af462244a6bbf7e2abaab114c83046a SHA-1: 5174592405e15e967ab8899bd6bf5ebdd2b9f553 SHA-256: 147be5bc206ceb91b2a4e7f924e35dfd840224bf55ba600dfb7d0fb6ff29cd9c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://huntic.ru/uplcv?utm_term=how+long+should+the+statement+of+purpose+be PDF link annotation
    • http://cuiquji.net/d/files/kizolupexezonon.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/zapumazopixowirewumesubo.pdfIn PDF document text
    • http://teakdeck.pl/files/file/86632953442.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/suwawax.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/34477193119.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/rifoxugare.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/75194876456.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/nubuduwonotasipusevula.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/tujotezuwage.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/fawepoteniwexipuzax.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/palotixuduxej.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/dovorugonow.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/nagekizikezasezufuwa.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/kufidulam.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/90331910642.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210911181229019551nk77ps7pzfg7.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/85867610683.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/gajirixaloxozakotoxivi.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/19739352352.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/lelov.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/98446920022.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/43047232907.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/675dab2eaf2c2e0d029c1876eba6d3c4/95574849905.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_off0000ad67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD67 15940 bytes
SHA-256: 9c36c2aa325abe77ed7100b0bb0fc2da5596cd478801228b18c61d308b275031
font_01_sfnt_off0000d611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD611 11172 bytes
SHA-256: f003e1050d55e793969c499de6909d854a8657f9b246f8d65306de489a3c8dbf
font_02_sfnt_off0000ef9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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