Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a99dd68659df139…

MALICIOUS

PDF

78.7 KB Created: 2021-03-24 02:26:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5a7c11e8be5d4a4034e7e5c4fe3370ad SHA-1: f651c22fe0ea43c8f4fad9562bbf406f6aeb1afd SHA-256: 4a99dd68659df13917f8ee7d5b54b42c077e184e56e0d243b4ea4bb0b8cdb40d
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The presence of 'utm_term' parameters in some URLs indicates tracking or redirection, further supporting a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://bologen.ru/strik?utm_term=power+pressure+cooker+xl+sale PDF link annotation
    • https://cdn.sqhk.co/gukugifixija/ijER8ib/62185162237.pdfIn PDF document text
    • https://cdn.sqhk.co/welosezu/fEkidTv/google_play_store_service_update_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470687/normal_602d27093eeb5.pdfIn PDF document text
    • http://infonewsuk.site/edius_6_free_download_full_version_with_crack_32_bitpcp44.pdfIn PDF document text
    • http://ralugugifoxatir.scienceontheweb.net/is_the_mandalorian_weekly_or_monthly.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460463/normal_5fcf4ace90631.pdfIn PDF document text
    • https://cdn.sqhk.co/tufuboloruj/ujfPgdu/wiseturixebujukolafun.pdfIn PDF document text
    • https://cdn.sqhk.co/jixuvepabu/hifRhgz/viruses_vs_bacteria_differences.pdfIn PDF document text
    • http://trikotoria.ru/devosamilevusivokav8fic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474985/normal_5fd120bf915f2.pdfIn PDF document text
    • http://technodom11.com/4894744972oa6at.pdfIn PDF document text
    • http://puzexijabin.mypressonline.com/bullying_at_school.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xobebol.onlinewebshop.net/how_to_be_a_cia_operative.pdfIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_21432b7751f9489e80b52ec49584acce.pdf?index=trueIn PDF document text
    • http://jelunegizubu.atwebpages.com/rigimemozajidawajidodijir.pdfIn PDF document text
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_755cf9468f2f45feabb6025a3805b353.pdf?index=trueIn PDF document text
    • https://80ce5912-1c67-4773-adf4-abf614566e91.filesusr.com/ugd/acb48a_c208212ae345413d8e70a8cb3afc5a86.pdf?index=trueIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_955c51dc39ec47e68bc699367bb07787.pdf?index=trueIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_7595cf9524f143bab80bad1b6d4eb5b5.pdf?index=trueIn PDF document text
    • http://zipemoluligera.myartsonline.com/tomorrow_when_the_war_began_book_1_chapter_summaries.pdfIn PDF document text
    • https://bb209e34-24c3-4901-88bd-c00af8cda710.filesusr.com/ugd/de6798_135ab98ed76043b6be1dcef567e391fd.pdf?index=trueIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_a920cad79a514237b5658e72df18daaf.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_off0000f6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C5 5152 bytes
SHA-256: 7cbc2e8580a5005a40d56081b453c4a6f72263362a555d38149877420dcb35dc
font_01_sfnt_off00010874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10874 11020 bytes
SHA-256: c1530a5c469abe20cdc6a003d83046580ae60c27aa001d5daffc13e5b26ca17b

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