Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef0ded8b8121253…

MALICIOUS

PDF

78.8 KB Created: 2021-04-04 22:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15396db32ea2e2388edf785517fb82f6 SHA-1: 7a7d7468a62072f7cf103a0acdf2570e07c61eda SHA-256: 5ef0ded8b8121253ae0bd893ddf7577b0baa457f4f76e2a274ccf38616659db9
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that mimics a search result for interview questions, likely intended to trick the user into clicking it. The presence of PDF_URI and EMBEDDED_URL heuristics further supports the phishing lure. No scripts were extracted, but the overall structure and heuristics point to a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/123?utm_term=executive+secretary+interview+questions+and+answers+pdf
    • http://leporabev.mywebcommunity.org/punujakowaxabimeti.pdf
    • http://blue-tick-central.com/7th_class_english_grammar_book24y7l.pdf
    • http://jaxagogilexet.sportsontheweb.net/7088382652.pdf
    • http://nigodofifulo.scienceontheweb.net/63319304851.pdf
    • http://teplotronic.ru/kubefeparofafx3vb5.pdf
    • http://letnesil.xyz/ejemplos_ecuaciones_de_primer_gradod9n1l.pdf
    • http://hookup754.fun/david_goes_to_school_reading_levelmtk5z.pdf
    • http://jokojujut.medianewsonline.com/how_to_end_a_legal_advice_letter.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/91596428-cd5c-4687-8aa5-a232056ef53a/the_adventures_of_sherlock_holmes_and_other_stories.pdf
    • http://domuromu.atwebpages.com/molecular_biology_techniques_resume.pdf
    • https://s3.amazonaws.com/wibedubosateg/werunomunufolakuselidi.pdf
    • http://fanalejowegop.atwebpages.com/tactics_for_listening_third_edition_tapescript.pdf
    • https://uploads.strikinglycdn.com/files/53d1f779-a305-44df-b6f9-06cd07ee0d0e/where_are_the_callanish_stones.pdf
    • http://molujafit.atwebpages.com/english_lesson_plan_for_kindergarten.pdf
    • https://uploads.strikinglycdn.com/files/a9392426-f2c8-4571-983c-64ec3bf2f130/polygon_interior_angle_sum_theorem_worksheet.pdf
    • https://s3.amazonaws.com/debiwelof/moxilekadapimatonexapomig.pdf
    • https://uploads.strikinglycdn.com/files/b247d1c8-2a58-4267-9eb3-687d1ba34b68/suzabeguxotupuzadebun.pdf
    • https://uploads.strikinglycdn.com/files/6a759964-d34a-4e18-96b8-56da208650ad/how_to_descale_nespresso_lattissima_plus.pdf
    • 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/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f781.bin
a846ff3c5388cbfbe2f1625a6cda2a590ca24362772b388bb73d95c89aefe784		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF781 5524 bytes
font_01_sfnt_off00010a7d.bin
bb2989e8cea521336542e12f35ffe30690a86df8d4b90d83680d2b86d8f961f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7D 10752 bytes

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