Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51759c06544a145…

MALICIOUS

PDF

76.4 KB Created: 2021-05-31 18:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: e1dd1a0419274f93af2275a916961fe2 SHA-1: 883affd07f55ee9e03e464f916e5f26702751bf2 SHA-256: d51759c06544a1454bce89bbd142780507edf365aee7efc6389111209a3ecbae
206 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. It uses a QR-code 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 0.9992

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pistant.ru/pbw?utm_term=pokemon+super+mystery+dungeon+qr+codes+deutsch PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465685/normal_5fe3ec4ec25b0.pdfIn PDF document text
    • https://ladetizor.weebly.com/uploads/1/3/4/7/134731735/donewom-xifuzitobe-rosem-jabumiwike.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454179/normal_606c69185c8a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528876/normal_5fe60db0b5855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460070/normal_60604233883d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501634/normal_5ff5ffe06f507.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457005/normal_5ffc917140e37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459463/normal_602e8374e6377.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504839/normal_6063e184151bf.pdfIn PDF document text
    • https://tusutaxuwipafu.weebly.com/uploads/1/3/4/4/134403355/478709.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489422/normal_60618a799fb1d.pdfIn PDF document text
    • https://sivubatololux.weebly.com/uploads/1/3/4/8/134850937/ruwiwo_kabakip_jiwapodave.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/17694aa9-b78f-43aa-9005-7ba972c7e7df/84292685276.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce9e250d-bb67-4da6-b0f8-fa40e05ecd64/57519254643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0d5ad0f-f158-4b52-ba3c-b630acebbe20/bim_project_execution_planning_guide_penn_state.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa698c31-efc9-4b65-bc08-93ee6820834e/gagolikafaravokepuba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9d82c8e-e6a8-40fd-a126-e4313ad3a472/sadelubodujugukonugu.pdfIn PDF document text
    • http://kekirow.pbworks.com/f/maxefujoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdc73126-5714-4256-bfa4-33d91f499933/what_grade_level_is_percy_jackson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7140c190-7108-41be-aa8c-ea4aab9533b1/jubetepesiwedavuwul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60116c71-4b71-42ad-a5dd-815ae5cd0e58/gibegasajebibarun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcc8828e-a7ad-4882-8b6b-9c72de5c1ebe/84888237949.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/56414774052.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_off0000ec70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC70 5536 bytes
SHA-256: 62bf19d5278ef27fc01d5cbf3befa3a6d9a86ee0a792fc2096fe9f4c9074fe1f
font_01_sfnt_off0000ff24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF24 11152 bytes
SHA-256: b10e120a6264413d230321409b6de035be943473facae12d7bd9434eee948c53