Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c661ef6ae2acb8…

MALICIOUS

PDF

76.6 KB Created: 2021-02-17 06:29:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c736e53847f8844dfe5a75bfae14faf9 SHA-1: b13ffeaf1dbe1a829674e991bc5322cbaaf495b6 SHA-256: b8c661ef6ae2acb814fce4c6ecd7b07447e7fb5134d38ded3c5e61a64298ac1d
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with the primary malicious URL being https://maypoin.ru/strik?utm_term=mecha+vs+kaiju+pdf. ClamAV detected this file as Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0, and an ML classifier also flagged it as malicious. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=mecha+vs+kaiju+pdf PDF link annotation
    • https://situzofunuk.weebly.com/uploads/1/3/5/3/135305293/kawikufafutofupug.pdfIn PDF document text
    • https://gakafapokizi.weebly.com/uploads/1/3/5/3/135319358/dolasafogiwog.pdfIn PDF document text
    • https://jepemanek.weebly.com/uploads/1/3/4/5/134589705/fovejezusomizemorife.pdfIn PDF document text
    • https://wogalipa.weebly.com/uploads/1/3/4/3/134316604/2749470.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379718/normal_5fc61bb28d813.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/zatazewoz/acfe_membership_form.pdfIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/best_biography_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/93671714697.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/london_real_estate_market_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/articles_grammar_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/american_mah_jongg_strategy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/vobapigakokul.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/casabianca_poem_questions_and_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_off0000ee44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE44 5320 bytes
SHA-256: f9660762b963cdd777fe941becbadebf85fa81686bc67636e8a08fee59d1a2df
font_01_sfnt_off0001007d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007D 10440 bytes
SHA-256: bc45982dc667cd6dfd99a332ad0b2e237edf19fdf8821a261d7fc322ed1aaf22

Open this report in the interactive analyzer, or submit your own file for analysis.