Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c43848fe119418b…

MALICIOUS

PDF

76.2 KB Created: 2021-04-15 04:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cd5a51237a10c579646fb31c7f3c3cb9 SHA-1: 101c3c33f1945d103519e91c7d1a78fbcc0af4fc SHA-256: 8c43848fe119418bfe6daeee7724df65aff8e4a154d2978e195fbac9ee539813
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=law+of+success+book+summary+pdf PDF link annotation
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn.sqhk.co/fijajiles/Cuieja5/wuwuniratawomarap.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/ihehb8W/magicavoxel_camera_controls.pdfIn PDF document text
    • http://sejapamuji.22web.org/android_app_system_requirements.pdfIn PDF document text
    • http://gogemupiru.22web.org/zataguvegixidizuruletavip.pdfIn PDF document text
    • http://ductsunlimitedins.com/zivibuzohx4e.pdfIn PDF document text
    • http://vadirikolofifi.iblogger.org/sifudiv.pdfIn PDF document text
    • https://cdn.sqhk.co/lisupixiwe/wibidhj/best_divergence_trading_strategy.pdfIn PDF document text
    • http://jakebaxujimug.22web.org/65520542320.pdfIn PDF document text
    • http://zabotokuke.iblogger.org/japanese_fashion_style_guide.pdfIn PDF document text
    • http://francobusiness.com/37163353263c5cpg.pdfIn PDF document text
    • http://pulaketuwogeza.22web.org/pharmacy_technician_resume_template_free.pdfIn PDF document text
    • http://noksipals.online/bluecoat_proxysg_configuration_guidevqg76.pdfIn PDF document text
    • https://cdn.sqhk.co/fexivijemozu/gdhbhbS/watch_nfl_live_online_free_seahawks.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jitimixilu.epizy.com/ford_mustang_price_in_india_2018.pdfIn PDF document text
    • https://25cf7bc6-226b-4013-96fa-c64d334b7dac.filesusr.com/ugd/317e1a_968bff0fa7dc452381ed35380b9a56f2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevelel/78786124235.pdfIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_e3f3ce86d1da42909a6b3e2f060e5e6f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jupoti/71166419575.pdfIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_7bd81f1304394f56a1d1adc94f5eab5a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/geraromu/ukulele_for_beginners_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/somimobofovavuda.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/55401219967.pdfIn PDF document text
    • https://a6668164-4238-4e0d-addb-cc4c62f58fca.filesusr.com/ugd/2dfcca_44957e462b1244d38cf57334bfa76ac1.pdf?index=trueIn 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_off0000eaad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAD 5608 bytes
SHA-256: 352072a802bc9d7b4dc8e235bb2dbf17f4ee236c2f0b27b6eecf208dab989554
font_01_sfnt_off0000fdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCA 10924 bytes
SHA-256: a1de0a063039a2d702be4f4ad9c6940d0f205641e6d5ad9f9ab2169959df10ef

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