Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a2923d86ad243dd…

MALICIOUS

PDF

106.5 KB Created: 2021-05-23 04:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7069435a7f7487fb3df59076d71d45d1 SHA-1: 3b193379ad4826a0835e214de3f12ed868b4352a SHA-256: 5a2923d86ad243dde57d11813de13b913bef352887bbf857d8552c987ff0b97d
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://leonvi.ru/strik?utm_term=what+is+anti+ragging PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388627/normal_5fdebebdaa445.pdfIn PDF document text
    • https://zogafopuniv.weebly.com/uploads/1/3/5/3/135390308/9724866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450043/normal_605616083621d.pdfIn PDF document text
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/54a93cd0b38ba8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370317/normal_60662d3613a4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376359/normal_5ffa38023099e.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/povelenavuviw/chrome_untuk_kali_linux.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/best_buy_receipt_template_psd.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/school_brochure_flyer_psd_templates_free_s.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aa4019c-43a3-4eb3-886a-a95cb5dc28c3/53976267913.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/the_boy_in_the_striped_pajamas_movie_actors.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/cutting_edge_elementary_3rd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/76298735473.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/18912771324.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/leo_tolstoy_three_questions_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/chromedriver_google_apis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b24b83c-6cbf-4c79-b21c-2b8ed9c291e5/35959470309.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/2004_dodge_ram_1500_rim_bolt_pattern.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db69ab60-1098-4d58-9469-f66359164e48/3859398965.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/coordinating_and_correlative_conjunctions_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/colts_cheerleaders_new_uniforms.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/queen_size_fitted_sheet_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/my_talking_tom_mod_apk_all_unlocked.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_off0001662f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1662F 4928 bytes
SHA-256: d1f8e91115d4c8b764584ecb76b671aa0c7ff3a6c8c022941289736250e2bbde
font_01_sfnt_off000176f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176F9 10832 bytes
SHA-256: 5523640ce4a89e08811ba738411d2758088ed3a8121b02661ad77c4074962f58