Malicious PDF — malware analysis report

Static analysis result for SHA-256 170c111189315b62…

MALICIOUS

PDF

95.7 KB Created: 2020-12-22 11:45:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3970352b73ce05946be53440d7d452c6 SHA-1: 11b5aad5ecc30dbb0d02d559d776daef89d99df3 SHA-256: 170c111189315b6208cc294283dc4fe4d02ae2a480bd7cd70cd39d1f902a2d03
224 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. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://gettraff.ru/strik?utm_term=mentorbox+reviews+quora In PDF document text
    • https://bubiwodepu.weebly.com/uploads/1/3/2/8/132815961/9723125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421966/normal_5f96dbb675867.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476135/normal_5fd35283e1755.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/jenemapis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412378/normal_5fcf4c015979f.pdfIn PDF document text
    • https://minazunanuvisim.weebly.com/uploads/1/3/4/6/134666394/tomoxofumi.pdfIn PDF document text
    • https://zevuvizaxetu.weebly.com/uploads/1/3/4/8/134887967/kuwobad_tesibimitif_tufoto_bivunugejevoxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/83466531429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d89141cd-817b-498a-9f1e-08cc3b947890/47374391900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2d0ccdd-4b1b-41ec-a48b-b9d94ad180b5/58639140211.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1057f405d5340f32a3beb/t/5fc88fac8eecd53e39ee1ae6/1606979501178/8_ball_pool_download_without_app_store.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/78252011527.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_off0001236e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236E 5140 bytes
SHA-256: c9d459b78214e544f8cf567a24c76a5e838b6395a90ec76399933b88cd2fa3e5
font_01_sfnt_off0001351b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351B 11516 bytes
SHA-256: c458fc081fa895cecb7012513dae47ac0a61ebb6a1764b4590426ebded7a2fb0
font_02_sfnt_off00015c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C82 16288 bytes
SHA-256: ef0fe5e4c3df87daa3c22f420b1c38346ade548d775f49ca8892d494fcc58392

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