Malicious PDF — malware analysis report

Static analysis result for SHA-256 1973cedf7fdc5f78…

MALICIOUS

PDF

73.8 KB Created: 2021-03-23 01:47:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 71a101e9270060b823ef71ec98672115 SHA-1: 895330b50270397c5a2b16376599e95b642c2f13 SHA-256: 1973cedf7fdc5f78aa967f75433839dc506894971eacbc049c6b715764334d52
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically `https://dafemum.ru/123?utm_term=facebook+lite++9apps+laptop`. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs and a visual download button lure further support a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://dafemum.ru/123?utm_term=facebook+lite++9apps+laptop In PDF document text
    • https://cdn.sqhk.co/pazaxefuma/a9gfgSl/mafia_city_rp_commands.pdfIn PDF document text
    • http://bukawavado.medianewsonline.com/fujitsu_digital_annealer.pdfIn PDF document text
    • https://rizafosukozesal.weebly.com/uploads/1/3/5/3/135346652/zaliw_toxebifarepur_setukivuruzu.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/platicas_prebautismales_cuauhtemoc_chihuahua.pdfIn PDF document text
    • http://timogefubor.22web.org/dezisitosetizexe.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/jaib4ic/91043052516.pdfIn PDF document text
    • https://sizokagijabid.weebly.com/uploads/1/3/4/6/134652394/be5380.pdfIn PDF document text
    • http://juzezudusota.mypressonline.com/easiest_way_to_learn_autocad_electrical.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://funixeja.rf.gd/1831345411.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/zijuwufores.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd502c94-6e82-476d-baa5-a9878c60ca13/latest_news_about_lockdown_in_india_extension.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/bazagozirorawegamafutepuv.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/23170214506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/003521bf-8b93-4f38-870b-317a93b18f6e/hunter_x_core_wireless_rain_sensor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c92f61c0-e99f-4e3d-a03c-cd23b85d9a42/pizzeria_da_marco_delivery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b319f172-74fd-4b62-a65d-d98d4e82e31f/sojalapuruzevuxoge.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/rolejavisaxetuje.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_off0000e502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE502 5148 bytes
SHA-256: f0c05e89e67c14802540e70ab1cfb3ae6b6bb1664ffd398bcf8078c781a8ccb0
font_01_sfnt_off0000f698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF698 10464 bytes
SHA-256: caaf303936956012b42a8ec76b7158777d156fdd9c06dfa5c8e637a045836448

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