Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5957cea61e7018…

MALICIOUS

PDF

72.4 KB Created: 2021-09-18 18:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e7f93fe0e5e9b19eb9a839251e4b4d90 SHA-1: 91fded9447fa64eb58824ae4b66f2a1ad5f6a15a SHA-256: 3e5957cea61e7018d674bdfd3d07eb533f2d5c593ee760b959fdde463cbf0c08
186 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to trick users into providing recovery secrets or private keys. Numerous external URLs are embedded, likely serving as lures or redirects for the phishing attempt.

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://allytemp.ru/uplcv?utm_term=redmi+note+8+private+dns+settings PDF link annotation
    • https://www.adoz.cz/ckfinder/userfiles/files/wagenapegorefosuxorowulir.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/zokifetawifef.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109081649591744.pdfIn PDF document text
    • http://centromp.it/userfiles/files/wunesokuxuvogurip.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/1569717999.pdfIn PDF document text
    • http://denge.aero/upload/files/rififilaxabivuxomaseva.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161409ac3c9703---67736688093.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/febusobixaxadovo.pdfIn PDF document text
    • https://laser123.com/geektic/files/67057027667.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/21197585684.pdfIn PDF document text
    • https://purefeeling8.com/data/file/44598106515.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/pizekero.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/35672665828.pdfIn PDF document text
    • https://preciseenergygroup.com/media/lomotewukot.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/26652155772.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133d7a52910c---64014452754.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/sipira.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/nikejodotile.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109180531475682.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/43757595218.pdfIn PDF document text
    • http://novichiha.ru/pic/file/lirimibefixorovepe.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_off0000b826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD038 16556 bytes
SHA-256: c67397255502680f062c31fbb2aa2cf8d9158127d4a60c764d53ea8fbfdf1cb4
font_02_sfnt_off0000fb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB04 11008 bytes
SHA-256: b2a2d8cbe471459f09b207f7ab126807e47331433ec713222273d503ef9f4ace

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