Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6e74d0a6a8f99f…

MALICIOUS

PDF

80.1 KB Created: 2021-03-29 10:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4a49025a458e1ec496c0d240f3fa2ec6 SHA-1: 79f94d9443f77095556801a2149810f2dc4b93b7 SHA-256: 8a6e74d0a6a8f99f33775f70e172f9e92ddbef370782c5d682d22e3fee17b74f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The embedded URLs are likely used to redirect users to malicious sites, potentially for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=does+harvester+ants+bite PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ce722411-b424-48ee-ac00-b4ed8818edd9.filesusr.com/ugd/bff0de_a3aa8a37838a40a5a9b881bb5fa7ad79.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vunizi/diguzifo.pdfIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_6a5c7863021a489280c616294360c660.pdf?index=trueIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_7d5a9d509ebb4db09480e61679763b99.pdf?index=trueIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_4e460a88dcb246788df2d0248d5a8a2a.pdf?index=trueIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_1340129564b445e18884f25e253b7c90.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c06fc05-ac11-4c09-84b6-cfd8692f9c94/amantes_del_desierto_capitulo_108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/389503ff-d178-4ba8-9bdb-009691227635/towards_a_new_architecture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e642f0e-975c-462d-9ae5-eb0aba6e5743/the_book_of_acts_chapter_3_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/cf_auto_root_apk_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b4eb60a-b7f3-47ea-a744-56db8e8b339f/43141508537.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/jolijaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6fd16ef-a272-4070-8dbc-077c3ce81aca/29682119348.pdfIn PDF document text
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_f65f4d7a65a14d2c8c20a2809135b620.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/278efadc-b806-467f-b675-4b92d9da128b/what_is_the_origin_of_police_in_america.pdfIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_84554973053a45fe820a445adfadb880.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rimepusox/nifijuduxaguvuliwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6d450e7-f1ce-47e5-a68f-e557cd641485/2943016249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f335a80c-8598-4c18-bbd8-5314cd7c688b/digital_marketing_degree_online_in_india.pdfIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_da9c859ed70848da9b3f3ab90930659b.pdf?index=trueIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_ef7cee7a6b8f4ae281ad387f6f5f5efa.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_off0000fb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB33 4940 bytes
SHA-256: c16e6496bc759ed9adb02b9553779b24cc48457cd532d77ca9d796382a99d9e3
font_01_sfnt_off00010c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C01 11548 bytes
SHA-256: a3fa92c2342548b359a81680a91fdf180ed0fc39f6d2b1856cd01162a6486148

Open this report in the interactive analyzer, or submit your own file for analysis.