Malicious PDF — malware analysis report

Static analysis result for SHA-256 bade6a6c2a8545cd…

MALICIOUS

PDF

76.6 KB Created: 2021-03-05 14:01:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 83d774ca77c1d7f7e65a047506b581dd SHA-1: b19c492d4ba4e59c1a6d39867ff3c8dd8d7eb42e SHA-256: bade6a6c2a8545cd2dd1ee50a50f3c5b8984cace6026f301f001a20419750f7f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a mass of external links, many of which are SEO-optimized and point to potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. The primary malicious URL identified is 'https://dugedepap.ru/strik?utm_term=diary+of+an+oxygen+thief+chapter+1+summary', which is likely used to host phishing content or a second-stage payload. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dugedepap.ru/strik?utm_term=diary+of+an+oxygen+thief+chapter+1+summary PDF link annotation
    • https://koropiliful.weebly.com/uploads/1/3/0/7/130740252/tigojomoxexuzo_zemokaz_fajenawotiz.pdfIn PDF document text
    • https://lidaleteso.weebly.com/uploads/1/3/4/0/134017218/noworipononuzux-watoxejadifok-jivemereb.pdfIn PDF document text
    • http://santand-es.com/nojiwewcc66h.pdfIn PDF document text
    • http://cpskras.website/how_to_change_battery_in_smoke_detector_hardwired_ukl30u5.pdfIn PDF document text
    • https://wokoxulepimam.weebly.com/uploads/1/3/1/4/131438011/dovodesaw_sidajipiwuroxig.pdfIn PDF document text
    • https://woxazalaxit.weebly.com/uploads/1/3/4/2/134235403/8edf82d28fb.pdfIn PDF document text
    • http://kigurumi.org/things_i_used_to_do_in_my_childhoodou7k8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://932aa67c-856a-4fda-9fc8-fe3f50d4acc2.filesusr.com/ugd/a25eee_92b20b70b5a54195b2a1aafd933c868d.pdf?index=trueIn PDF document text
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_aab75674a0e54dbbb1cf40b6d8459db8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b35ce06-50a2-4c47-b80a-3877037a8e45/poziz.pdfIn PDF document text
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_69903e161eeb4e38bb4dcc9f73f99a03.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lezerawe/50205252007.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/slanted_happy_face_answers.pdfIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_8033aa0ba5944985b4e68c1039cf4ee5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/xalilikikutijeposebu.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/barejiga.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/compile_error_in_hidden_module_sheet_3.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/5554762903.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/4940090090.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c188aa09-acb5-4cfd-9e97-c4a8d12fb857/armitron_45_7012_alarm.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/tudezote.pdfIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_fab0e11f07304de08c9c59af7d0325fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/toguvaju/jujilotezijifinun.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_off0000ec81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC81 5620 bytes
SHA-256: bf69af6428349a6deb2df5c554b38d91543bde712c05e1b4d06768c82795333b
font_01_sfnt_off0000ff9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9E 10820 bytes
SHA-256: 46a0d4bbd4145b5cabcac06d2b90c7b1a6f074673dd3eee020c95016c3497667

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