Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d98d74d1f3c1458…

MALICIOUS

PDF

72.1 KB Created: 2021-03-07 10:35:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afcced7d653a2269e3eac916dcfecf80 SHA-1: 2b92fbe272bb703ccaf71f8a293b4e93172d9592 SHA-256: 0d98d74d1f3c14580abf707914e979695fb5edf9655a77c2617bb00830094b96
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 dynamically generated, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to reference printer troubleshooting, a common lure. The presence of multiple external URIs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/aws?utm_term=brother+hl-2240d+toner+light+stays+on
    • https://bokosemebejira.weebly.com/uploads/1/3/0/8/130813317/29f9e.pdf
    • https://cdn.sqhk.co/zidexamuwela/jjGZYha/fukalerovovavalupem.pdf
    • https://cdn.sqhk.co/sujubowip/jrgcBgh/good_football_drills_for_11_year_olds.pdf
    • http://everydays.space/edudel_date_sheet_2019_sa17j6k9.pdf
    • http://igbusinessabouthelp.com/accounting_and_finance_for_banking_3rd_edition3sqwr.pdf
    • https://bubijusafas.weebly.com/uploads/1/3/5/9/135994311/44990da8b6fa.pdf
    • https://karaxofuko.weebly.com/uploads/1/3/5/3/135344752/8b114.pdf
    • https://cdn.sqhk.co/sekigizakeku/gcSIidh/cnc_machinist_jobs_in_pearland_tx.pdf
    • http://b4shop.icu/zinuvizekodekofartxs37.pdf
    • https://wejigewaja.weebly.com/uploads/1/3/5/4/135400860/jufuduwugar_zakajaxe.pdf
    • https://gomadiwisedewun.weebly.com/uploads/1/3/5/3/135314557/tubexuzimabo_xubulozopiz.pdf
    • https://cdn.sqhk.co/moleselofa/ijgjcBn/3d_supermarket_race_game_java.pdf
    • https://nusuxoxoli.weebly.com/uploads/1/3/2/7/132710665/4352ef8a.pdf
    • https://soxiwavarado.weebly.com/uploads/1/3/1/4/131437421/tupidiwot-risubot-wegarewefijiku-lelodaxojuve.pdf
    • http://ig-copyrightviolation.com/jebefofuzujimiluwidmfktc.pdf
    • http://joy-todays.online/business_letter_template_multiple_pages8zrq2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_0aaecdfd7a334235aac97f3d8d79582d.pdf?index=true
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_755569fc3e0548359ccef4bfb868c4aa.pdf?index=true
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_8dc084a450bd4ba8b0d1dcba4310f919.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd3f.bin
353e1daed6b075acbf2721c595f09e73cf5a1ca5d93b0f2f8e8753453968cb77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3F 5632 bytes
font_01_sfnt_off0000f071.bin
d014118ae47539b0b8f367c5d768e769dc6601f72f4b2e28ba9774c6d1f441df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 10204 bytes

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