Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b087c9abc902318…

MALICIOUS

PDF

82.1 KB Created: 2021-02-03 16:58:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: aa9f8e5e0a4875130d186af9eecd4d30 SHA-1: c747e83fa032ac22417573c79bc2861340dc28bb SHA-256: 6b087c9abc9023181617185fb8c575ed9f98a64539cf563b34e6cc8c5f376fff
154 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical alert for a PDF redirector link to 'https://yafferge.ru/123?utm_term=merchant+empire+ck2'. The ML classifier also strongly flagged the PDF. The ClamAV detection name 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' further supports a phishing or trojan payload. The embedded URL is the primary indicator of malicious intent, likely leading to a phishing page or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://yafferge.ru/123?utm_term=merchant+empire+ck2 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4421352/normal_5fe7c9fb2b377.pdfIn PDF document text
    • https://migirebunimalab.weebly.com/uploads/1/3/1/3/131383914/pasorezuwebavig-bakowutegofo-lifilowabas-mufer.pdfIn PDF document text
    • http://antonioit.fun/roadmaster_red_wagon_assembly_instructions301oq.pdfIn PDF document text
    • https://vojonabof.weebly.com/uploads/1/3/1/3/131383251/midosezuvagezu.pdfIn PDF document text
    • https://cdn.sqhk.co/tokafumotebi/IMi7ibW/nurapujob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413005/normal_5ff2809c3c170.pdfIn PDF document text
    • http://3gusevshop.space/canada_food_guide_202005jzq.pdfIn PDF document text
    • https://pukakanasosakum.weebly.com/uploads/1/3/5/3/135392678/734946.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417315/normal_5ff945660fe9f.pdfIn PDF document text
    • https://samabuwe.weebly.com/uploads/1/3/0/7/130739499/6409956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462362/normal_5fdac680c1fce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496378/normal_5fed4f962062f.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/nvdgdVR/continental_race_king_protection_26_inch_mtb_tire.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407318/normal_5fe4d5a51b6a9.pdfIn PDF document text
    • https://cdn.sqhk.co/likafupat/JL7UjaO/77431031064.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404515/normal_60009a72d6f7c.pdfIn PDF document text
    • https://vosewisujar.weebly.com/uploads/1/3/5/3/135398140/9d7b58e48.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/jidosatikim/cadence_of_hyrule_speedrun_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/4917188904.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_off000104d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D3 5164 bytes
SHA-256: 4f42858f8a3e6b6a20124600332766d8eafc1791be84b08143e150a48b6282b5
font_01_sfnt_off00011647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11647 10944 bytes
SHA-256: 4395972171920c6afc2d60dde0c80a4d912042becca34e049308bb84f550137e

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