Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e09cb37d86c283b…

MALICIOUS

PDF

72.6 KB Created: 2021-03-29 14:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b905e9b43f817978693ebbb69b9b9218 SHA-1: 9ab1c661efe6055824f353e086d9e55ab6502aab SHA-256: 8e09cb37d86c283bf41916c8f54836f58442257ebb07a60d5666c36bb8d5fb34
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains multiple embedded URLs, with one specifically pointing to 'leonvi.ru', suggesting a redirection to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further supporting a malicious intent to distribute links. No scripts were extracted, but the overall structure and URL findings point to a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/award?keyword=demography+book+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460241/normal_603e446277d8a.pdfIn PDF document text
    • https://cdn.sqhk.co/vumatoxikom/5YghIfC/btd5_hacked_unblocked_ninja_kiwi.pdfIn PDF document text
    • https://cdn.sqhk.co/keridola/oEjgLhi/dude_perfect_hunting_stereotypes_videos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446650/normal_6031d411f1c41.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/ibhavif/parental_approval_for_apps.pdfIn PDF document text
    • http://biwedujurar.mywebcommunity.org/what_is_the_top_rated_shark_vacuum.pdfIn PDF document text
    • http://pakawuwujawo.getenjoyment.net/ziwejibimazibo.pdfIn PDF document text
    • http://vimabanu.sportsontheweb.net/lezab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445726/normal_5ff0c5c85275b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470533/normal_6016092d29dcc.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/creative_writing_prompts_worksheets.pdfIn PDF document text
    • http://bazunujovi.scienceontheweb.net/bcom_1st_year_english_book_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wepiwojeta/hiEhajR/89707989677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484114/normal_604dc7611f81e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_8876facda74a4f8ab287715b70ccb2dc.pdf?index=trueIn PDF document text
    • http://saxodanokijaj.atwebpages.com/what_certifications_should_i_get_for_cyber_security.pdfIn PDF document text
    • http://rolubumemetujin.atwebpages.com/fokawowimo.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/33003601717.pdfIn PDF document text
    • https://a24bc4ef-4ee2-4fae-af0c-c9fea810b245.filesusr.com/ugd/67d96c_7ee0159ab0714d75a25815869d512674.pdf?index=trueIn PDF document text
    • http://fazatela.myartsonline.com/568952122.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/tututipatumot.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/15614911561.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_off0000dc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC65 5672 bytes
SHA-256: 1738dccf93758723b9d089f2999817d75ea61706047c22c8dc1da2fadb19e353
font_01_sfnt_off0000efab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAB 10500 bytes
SHA-256: 187f9d1dc3d0a51f04fee15857968bea175ae5531996fba855982c750ba80e50

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