Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ad7a85e80af96f…

MALICIOUS

PDF

85.2 KB Created: 2021-05-30 20:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b666ad0e09950922c52d0c4447902602 SHA-1: fc96e55cefb707b7809fc49301f4e3b70c2dd868 SHA-256: f7ad7a85e80af96f959ac037613b5375c7118c3be269178b2fe5fc9fab1aeaf7
186 Risk Score

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 0.9992

Heuristics 6

  • 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 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://druttle.ru/123?utm_term=samsung+s7+emulator+for+android+studio PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381082/normal_6025760477be5.pdfIn PDF document text
    • https://peniwifagupe.weebly.com/uploads/1/3/0/7/130738894/9df03625d9bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367950/normal_606330271c994.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368246/normal_6007584e56242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388181/normal_602a7207bc7d2.pdfIn PDF document text
    • https://soxobepasi.weebly.com/uploads/1/3/4/6/134677568/dosorali-lerodusimitaso-webapa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450512/normal_5fd2dc6a56a3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459058/normal_602a3a35ecb8d.pdfIn PDF document text
    • https://jisokegapusat.weebly.com/uploads/1/3/3/9/133997819/gusopulebu.pdfIn PDF document text
    • https://vitiwujujoter.weebly.com/uploads/1/3/4/6/134659282/tenawe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387929/normal_605fbdd17a0c1.pdfIn PDF document text
    • https://rajopolaxobi.weebly.com/uploads/1/3/1/4/131406270/5524871.pdfIn PDF document text
    • https://wipugetawunuw.weebly.com/uploads/1/3/5/3/135302850/0d9d6ec0cbd3455.pdfIn PDF document text
    • https://jugoneworo.weebly.com/uploads/1/3/4/3/134307205/wosul.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4468823/normal_60afea98533c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490132/normal_602da423351b9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e824a05-1372-40fa-9aee-de27210ae555/23742772326.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86d8c326-aa57-491c-91f5-1e9e5957a0db/reading_comprehension_worksheets_2nd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e3c240c-dc75-4361-89da-7bfbd7f64489/gudaxuvuvuvogibabapun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64451d98-a48b-4baa-9f4e-0ef168373aed/9032435500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/055f4a42-3740-4f4e-9386-d7cd3a676662/13_reasons_why_plot_season_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04650de0-4c45-49c2-9f46-ee9e86ae0b26/91334824489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbee291b-90ad-4ee1-afb9-7aa4126c3b0a/wafuwifaminow.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF25 5408 bytes
SHA-256: bd192bf0338fd20ace74eb026536475adb02e20dcbca7b84d34ed3ad598d7e45
font_01_sfnt_off0001017d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 15448 bytes
SHA-256: a5ab8898f1da6d67156f77abef8034533a9330a4de41f36b5c70971959bc0257
font_02_sfnt_off000131be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BE 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15