Malicious PDF — malware analysis report

Static analysis result for SHA-256 624cc327defa01ea…

MALICIOUS

PDF

72.0 KB Created: 2021-05-07 01:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf96e0ff0d5a58de0d11dde8f5e772c6 SHA-1: 9d315125fac6ead96613b315fbd1d8abf90ce970 SHA-256: 624cc327defa01ea7862294673b2b4e5e2b1245a735eb749bb79ddb6cfb8709f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URL that directs users to a suspicious domain, likely to host a malicious payload or phishing page. The document body, though heavily obfuscated, suggests a lure related to a 'vocabulary answer key'. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://krisoc.ru/uplcv?utm_term=constitutional+convention+vocabulary+part+2+answer+key
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3c7nueo9pbkdt13pmraejb2r8o/rabebuninosanilexexipemu.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/a4608928f36bdf7211eec36a6eafb4bb/20377106017.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/27e4b1956087f1e692469ee68a50ca70/donugovokininakikolamu.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/27b234e35e4bda1cca5bca171bf30b58/75990519822.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc79f3120b---porofovavezarojes.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/1fa4c6c01306134a32c7b1c635de794a/276114111.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1eecb8027---tevifupaga.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/80388058c7563e65bac002d8679cd19a/66660746104.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/r10i120ig2l7lainrkvdc2meb8/zerakawomesotojogexika.pdf
    • http://www.sport-konyv.hu/userfiles/file/fuvamepajobamasuliragipo.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/78207642860.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/b19682291e52314566d0d8a09a768a53/75379066682.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d338fbfc2d---mumexefafezemuji.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/sexomepumazasugazuzobawo.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607db91ce5015---bukokul.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075862a3864e---sunojadup.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160812e2ae03ab---29312518654.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/fal94gp7sva355la27l7o6n0ib/sogosokipepomukupano.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908e9aca663---nuvoxewu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df60.bin
998ad8a2fa6cfbfd23f8fbe88f93674edde2ea6e143434cf6d316746d1e0ea59		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF60 5420 bytes
font_01_sfnt_off0000f1f9.bin
b1d6f876b2a5c47dc7954cb794db3b870005a38c46106c8037d34c123de58463		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F9 10268 bytes

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