Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff73c71d81ef544…

MALICIOUS

PDF

115.6 KB Created: 2021-04-07 14:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c8b01b7b64d6845a0c4d90e55bcde38b SHA-1: 74f06d97939530586dd491c7d35c71b41c46b57b SHA-256: 2ff73c71d81ef54491f5b03e77f858ff189dd1e1fe3639059134dd9a77ec2d08
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 0.9993

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://druttle.ru/strik?utm_term=robin+hood+and+the+monk+translation PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384325/normal_5fe53dfdd9311.pdfIn PDF document text
    • http://womovenum.sportsontheweb.net/html_to_mac.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/consejo_de_participacion_social_seph.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489835/normal_60230a06cf050.pdfIn PDF document text
    • http://saniwigudovo.scienceontheweb.net/carlos_slim_biography.pdfIn PDF document text
    • https://luzatewuxajexi.weebly.com/uploads/1/3/4/2/134265782/natexamadazoja_gutitozotalujuz_zomagagip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408336/normal_603ce17d34949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483873/normal_6038fe958f24b.pdfIn PDF document text
    • https://zazanopub.weebly.com/uploads/1/3/2/7/132712119/04394ec213f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386852/normal_606d19cbf2730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408324/normal_6015d88aec25c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386618/normal_603790aa6bb09.pdfIn PDF document text
    • https://gunomelovolif.weebly.com/uploads/1/3/4/7/134735852/warowagidepeso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_34a255ed9f8d4d51a4339b01e70161f8.pdf?index=trueIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_939721416b8744759f524390da15d4ac.pdf?index=trueIn PDF document text
    • http://farovosodiwes.atwebpages.com/cell_biology_for_neet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d645581d-8c42-44e2-93cc-4f94deb1af94/take_ivy_cuttings.pdfIn PDF document text
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_3d3fe7277a414182ae6f49070d985ec0.pdf?index=trueIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_ad861f2630e94b088b01dbfea5fb034a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e11d714-e08e-4332-8129-c8f470e39b39/wejizamejefutunalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d31d0fa7-d25e-4cef-a233-b9527924871f/international_journal_of_autonomous_and_adaptive_communications_systems_impact_factor.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B78 5064 bytes
SHA-256: 2659f3b1e15161faeee90058b3d62a7a691d6a05ee355e5255e547d8904d9781
font_01_sfnt_off00018c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C6A 11244 bytes
SHA-256: d999ee9df6c2eee17c4f7383a5c53950c1065777240cdb26d162611ccabceaae
font_02_sfnt_off0001b264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B264 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34