Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac9253f614ff4719…

MALICIOUS

PDF

75.2 KB Created: 2021-06-01 02:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94a33a23d242fc0d3f58633b1fb4b2f5 SHA-1: 2bd3c5cb81df276b441bcdc7da36643379a4fa6a SHA-256: ac9253f614ff4719b0d0f64c6bcfc9c66ef1460859d7f1f2b1c39e0148d099d0
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF with a high ML classifier score and ClamAV detection indicating malicious content. It contains an embedded URI pointing to 'drafthe.ru', which is likely a phishing or malware distribution site. The presence of a 'download button' heuristic further supports a lure-based attack pattern. No scripts were extracted, but the overall evidence points to a malicious PDF designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/pbw?utm_term=circular+chair+cad+block
    • https://goraworozegisu.weebly.com/uploads/1/3/4/3/134324811/foloz.pdf
    • https://cdn-cms.f-static.net/uploads/4404105/normal_60527e79ba2cb.pdf
    • https://cdn-cms.f-static.net/uploads/4375889/normal_6023190706880.pdf
    • https://static.s123-cdn-static.com/uploads/4387825/normal_5fe54f1686bb5.pdf
    • https://gaxifuxizuru.weebly.com/uploads/1/3/0/7/130739475/3744180.pdf
    • https://kitafawavan.weebly.com/uploads/1/3/4/7/134702073/8cc188c5.pdf
    • https://cdn-cms.f-static.net/uploads/4495536/normal_603bd62b59fa8.pdf
    • https://static.s123-cdn-static.com/uploads/4418590/normal_5fefb44160082.pdf
    • https://cdn-cms.f-static.net/uploads/4403539/normal_60419a5c7d407.pdf
    • https://cdn-cms.f-static.net/uploads/4465703/normal_60449a760a59e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://lekipirunezi.pbworks.com/w/file/fetch/144416496/verbs_worksheet_for_2nd_grade.pdf
    • http://bupataved.pbworks.com/w/file/fetch/144419643/minna_no_nihongo_shokyu_1_hyojun_mondaishu_workbook.pdf
    • http://xosufixemuf.pbworks.com/w/file/fetch/144431958/pro_football_game_tonight_on_tv.pdf
    • http://sonopewobu.pbworks.com/w/file/fetch/144420645/electric_slide_dance_steps_sheet.pdf
    • http://bofamawetodo.pbworks.com/w/file/fetch/144433620/4514964178.pdf
    • http://visetululiv.pbworks.com/f/61858409723.pdf
    • http://didaneguk.pbworks.com/w/file/fetch/144428304/descargar_five_nights_at_freddys_3_full_apk.pdf
    • http://lugozamuxika.pbworks.com/w/file/fetch/144415032/81714668583.pdf
    • http://niwomif.pbworks.com/f/spoken_english_study_material_free_download.pdf
    • http://jesababa.pbworks.com/f/lafavebapomawuvevakatepo.pdf
    • http://kedetuwi.pbworks.com/w/file/fetch/144428940/how_to_use_my_proform_treadmill_without_ifit.pdf
    • http://foziwedugumu.pbworks.com/w/file/fetch/144432867/4022717107.pdf
    • http://wozixokumo.pbworks.com/w/file/fetch/144433596/esen_yaynlar_9.snf_matematik_konu_zetli_soru_bankas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db89.bin
a3d2b115d333c27156e4ea2f997bac7f6f3afe72ebab4ac0b682e78d45571fe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB89 4656 bytes
font_01_sfnt_off0000eb52.bin
272f940485af087b63ccf87980ac5f3cec0b3f940315b4bc6c1e372f85a823df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB52 11404 bytes
font_02_sfnt_off00011193.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11193 4324 bytes

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