Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b1cd723bb2d574…

MALICIOUS

PDF

72.7 KB Created: 2021-02-21 05:46:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: ebbc547ab49d1fc215c76b9d11a61993 SHA-1: 15db4df1321f98aca8341f209060d6c16a91927e SHA-256: c3b1cd723bb2d57404565732de91e521e94079cc8ded03e8f0b519efd543ec35
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links pointing to various domains, many of which appear to be disposable hosting. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, with the primary goal being to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/strik?utm_term=the+she+book+tanya+markul+pdf PDF link annotation
    • https://cdn.sqhk.co/voxedijudibo/lgdhgja/oil_price_news_today_reuters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391326/normal_6014730446ccf.pdfIn PDF document text
    • http://indital.fun/delta_math_answers_key_calculusk8kyh.pdfIn PDF document text
    • https://benipotuwazel.weebly.com/uploads/1/3/4/4/134445242/ziwojowosifapexu.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/iixFahj/tubbo_dream_smp_merch.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/gggd0ic/cultist_tft_set_4.pdfIn PDF document text
    • http://jakor.pro/52651342135o9c47.pdfIn PDF document text
    • https://cdn.sqhk.co/wukufazujuv/fqhdgcV/81089977928.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443810/normal_5fe9500bf3ecf.pdfIn PDF document text
    • https://cdn.sqhk.co/fofateze/jfMhgVs/66063779370.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374853/normal_5fdc4c8be6882.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/ffjhzPR/download_game_enemy_gates_stealth_war_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464297/normal_5ffe2583f3245.pdfIn PDF document text
    • https://natesikapepik.weebly.com/uploads/1/3/4/7/134750077/d61bc51694.pdfIn PDF document text
    • http://smartradiobf.ru/shure_psm_300jx0nu.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/fuwenoxuzasila/summer_internship_project_report_front_page.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/78786872905.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/acceleration_word_problems_with_answers.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_off0000de57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE57 5536 bytes
SHA-256: ceb17baf8aae93aa1fce98db95b19517d618d50827d05256b7327bc3308eccaf
font_01_sfnt_off0000f103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF103 10860 bytes
SHA-256: 916d41073f7cccc64c88e37d846b64050106629b80be10cfa72aeaa2956b0366

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