Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd036b03abdd7f8b…

MALICIOUS

PDF

71.1 KB Created: 2021-04-07 01:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 00e9b03f7b529d0e53e2f30be4b74579 SHA-1: 75cbbe16c4bef198342f82788caba2f6b6831a50 SHA-256: dd036b03abdd7f8ba03aa6cdfa29bb2afc8a5d7c6dc67b702621496004c1e72a
166 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. 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
  • 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.
  • 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/award?keyword=reading+and+writing+1+oxford+primary+skills+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450158/normal_6066108b4b9c0.pdfIn PDF document text
    • http://janorewaxeno.mygamesonline.org/who_is_the_father_of_western_civilization.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465270/normal_60344ef9f09d2.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/39386440102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498404/normal_6066e1383ec77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494681/normal_6022f80fa132f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495269/normal_601d2cddc96d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491723/normal_6001e1dfef1ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405925/normal_60399ead47461.pdfIn PDF document text
    • http://biwedujurar.mywebcommunity.org/successful_marketing_strategies_examples.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391896/normal_602f9e43f3900.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444386/normal_5fd09bc1decae.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/how_to_treat_adderall_withdrawal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464525/normal_60019d6c890eb.pdfIn PDF document text
    • http://tigafik.mygamesonline.org/41460970900.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479707/normal_605d66234f32b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369514/normal_6038d038d6c69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481527/normal_6016776b350b5.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/d57a74a7-a930-4a68-9e07-5f2fa9f3935b/can_i_use_any_automatic_transmission_fluid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/247f4a23-9448-4a1b-bd89-32332b46b9e7/diablo_2_1.13_d_patch_notes.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_off0000ce28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE28 5748 bytes
SHA-256: c6963a911516983322d1eb5c63a211a45d54534a40b74e2cd72b095ea7246e90
font_01_sfnt_off0000e1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D8 14304 bytes
SHA-256: 1110bbb221fecb98033abbd44a28679f5f783f026b2fde8da91103a01d0ad8c8

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