Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5ead634b025451…

MALICIOUS

PDF

79.1 KB Created: 2021-04-07 20:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dd0e43b56a61329112b8f279ff6dd5b2 SHA-1: 10a2b65c5eb375330733643b2bab6bf42b05fff4 SHA-256: 2b5ead634b02545151e2fb6fde1850d3b6f99c9fcaf3760c1f7f3882377aeba9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9996

Heuristics 6

  • 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.
  • 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://gimoguvi.ru/wix?keyword=prentice+hall+biology+final+exam+study+guide PDF link annotation
    • https://cdn.sqhk.co/livulopo/hhjh38c/tefuraxiso.pdfIn PDF document text
    • http://mnclassis.org/the_norton_reader_14th_edition_mla_update_ebookr8y60.pdfIn PDF document text
    • http://servempieza.site/wigebij6des.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimole/zjcZ7oQ/ping_pong_game_rules.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/gcjbihg/42345875561.pdfIn PDF document text
    • http://abwaab.su/what_is_a_callusesmn37d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376625/normal_5ffbce5e08f21.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/gizghmt/58683137520.pdfIn PDF document text
    • http://losqutoq.online/52451535772x2xtl.pdfIn PDF document text
    • https://cdn.sqhk.co/fosulavale/ggbM5mp/acronis_true_image_2019_winpe_iso.pdfIn PDF document text
    • https://cdn.sqhk.co/femuzetoj/lySLLBH/hfea_zika_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/zamokaxu/jDictig/love_yourself_answer_fanchants.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474218/normal_6018a0f1aa934.pdfIn PDF document text
    • http://popibiku.22web.org/85891481793.pdfIn PDF document text
    • http://texno3ua.com/yaesu_ft_950_service_manuallzl66.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_72eaedaa2e5b42339ababe7dd1791c7a.pdf?index=trueIn PDF document text
    • http://riwexakax.epizy.com/best_for_green_juice_breville_juice_fountain_elite_cold_press_juicer.pdfIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_44d18161870c43ee89023ce56c7c4adc.pdf?index=trueIn PDF document text
    • http://jizozekawa.epizy.com/bachianinha_1_tab.pdfIn PDF document text
    • https://7835c217-6b95-46a1-915a-76cdebae3fe0.filesusr.com/ugd/debfb4_ed2dde477ea54c8abde0b842a418ddc3.pdf?index=trueIn PDF document text
    • http://febuner.epizy.com/81276768139.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_off0000f632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF632 5744 bytes
SHA-256: a5a0c877876ef2d6692168048c620f6552d1a8d9ad776fe87f9f6a2dc49335c1
font_01_sfnt_off000109a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A4 10788 bytes
SHA-256: 9b07a6f05d15990dd9751c6bba31004f268029ce939e9aa0c808f482ddb20cfd

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