Malicious PDF — malware analysis report

Static analysis result for SHA-256 422d3a0a75685000…

MALICIOUS

PDF

72.1 KB Created: 2021-02-27 00:57:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 6858a9cf68b5b80cbff461513b26b2cb SHA-1: 0d243de20a0cdebea5a1695d7a44b2c298197a00 SHA-256: 422d3a0a75685000d9e7d64c5df052e2dff8066ac47e78eedc0addad19f882e2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or SEO spam operation. One of the primary links, 'https://bologen.ru/award?keyword=harry+potter+advent+calendar+2019+day+18', is presented in a way that could be a lure for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

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://bologen.ru/award?keyword=harry+potter+advent+calendar+2019+day+18 PDF link annotation
    • https://cdn.sqhk.co/xidatelo/iicDzaP/idle_ark_built_at_sea_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/botuvawezej/Mjchieb/ravozetiximuka.pdfIn PDF document text
    • http://cleanup-sale.site/30326939516grg02.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/gre_quantitative_comparison_questions.pdfIn PDF document text
    • http://cuzinfo.ru/jazumisenabodkhxsr.pdfIn PDF document text
    • https://rilewinip.weebly.com/uploads/1/3/5/9/135964764/gabaroj.pdfIn PDF document text
    • https://cdn.sqhk.co/fezifoxunif/She54hv/kosaboma.pdfIn PDF document text
    • http://straponartist.com/what_is_wisdom_and_knowledge_in_the_biblebbpjw.pdfIn PDF document text
    • https://mojogobiwed.weebly.com/uploads/1/3/4/7/134747953/jiwinajanegebetu.pdfIn PDF document text
    • https://cdn.sqhk.co/riroxale/Gghjfbm/square_enix_software_token_emergency_removal.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/gezizefefififa/cibola_burn_epub_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/sample_weekly_work_schedule_template.pdfIn PDF document text
    • http://nixomirorubu.myartsonline.com/leribufutoxenasenexuniz.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/tegikotojiniv.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/26504685576.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/43347537785.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_off0000dc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0E 5688 bytes
SHA-256: 7057f8db304c99ae50f48f9e8e774d013bcdb40337df0ab66097c092e6f2bed7
font_01_sfnt_off0000ef8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8F 10444 bytes
SHA-256: f10830c17167fb45f63dddd64524e791b4d74a29db7b60fe9cee3b8e66fd5ddf

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