Malicious PDF — malware analysis report

Static analysis result for SHA-256 44196b982450cea2…

MALICIOUS

PDF

79.4 KB Created: 2021-04-01 19:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 017527f9b5a918e626cbf00e6f616db6 SHA-1: 011ef860c783db7c5f9d77e784fed26cb0915e4c SHA-256: 44196b982450cea24275496f4ff77dc46b56ede3d98ef31ad3be6d07c4ac440c
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 URI pointing to a suspicious domain, pelibifir.ru, which is presented as a download link for 'classic human anatomy pdf download'. This indicates a social engineering attempt to trick the user into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/award?keyword=classic+human+anatomy+pdf+download PDF link annotation
    • http://am-sound.ru/26815194766qryjr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386347/normal_60428957bce2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456712/normal_5fccdfced995e.pdfIn PDF document text
    • http://worldthailand.fun/915785076vbmbb.pdfIn PDF document text
    • http://daravto18.ru/zumuwolidomupelitilom86xeh.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453732/normal_60494d9e5d150.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477635/normal_5fdef8a589a8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496812/normal_60538faa0a54e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vavale/potodima.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/44395811582.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af0f03f7-e5fe-4ee5-95ed-5f459b43feeb/ejemplos_de_monografas_hechas_en_word.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/minuwopiginonebifi.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/pawowu.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/kolenujukoridigefosed.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/wosinimepifopazape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1ba0ac5-0a5d-47c6-95bb-8e7a88d9477b/89333072877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d7bbf0e-84bc-4479-a2b9-ad5cd1bbe37f/59824225114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/308a54b7-7979-452b-ac5f-6ce06152624e/13950971443.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/sample_iso_27001_internal_audit_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeaccdf7-2b13-4b6e-91ca-83dd6a73d13c/rizewozovofofovigin.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/zabamebimuzutevuvex.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78E 5400 bytes
SHA-256: 097cd7066d1fd4e1d6a28df391866aeccd43e8f9ad7638e35b5bb6890ea36e3d
font_01_sfnt_off000109db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DB 11248 bytes
SHA-256: 6ceae35a349eb1226d2222728ec014cb9ad3db766b78ad17a8edbf05eee61b45

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