Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e3b939f5d09b7eb…

MALICIOUS

PDF

78.4 KB Created: 2021-03-19 16:45:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5f65bea5498fabd469bd255b60aee5b6 SHA-1: 918462d80ae86659aa64a2f66c744aa7771e5f00 SHA-256: 6e3b939f5d09b7eb6a3c145c19115e0953cda2818d38f4f15e67025a33c2257a
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 0.9998

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://golowaki.ru/strik?utm_term=keurig+2.0+filter+replacement+directions PDF link annotation
    • https://jibigevemur.weebly.com/uploads/1/3/0/8/130873945/mufogowisutid.pdfIn PDF document text
    • https://nasabera.weebly.com/uploads/1/3/4/4/134447265/eca40d.pdfIn PDF document text
    • https://tekoriforeta.weebly.com/uploads/1/3/4/6/134639422/pazakojuxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484156/normal_5fd3dca363428.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388271/normal_5fd68f637a6bd.pdfIn PDF document text
    • http://lolafoduluj.22web.org/nidopixobirudogugixe.pdfIn PDF document text
    • https://temerineg.weebly.com/uploads/1/3/0/9/130969052/5973263.pdfIn PDF document text
    • https://webuxeneme.weebly.com/uploads/1/3/4/3/134368634/653038.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/36a2140e-4218-4bea-94e4-49064f6d16bd/rofelikuzagipulegapobure.pdfIn PDF document text
    • http://romajox.epizy.com/a_history_of_the_world_in_six_glasses_wine_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ba861c5-a614-4086-8dc5-8adf81e41fe1/39104838890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30db56ff-9c64-45b5-8fc6-bbb3f472dd8e/what_do_you_italicize_in_chicago_style.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dad2fd6-e6c3-480e-a579-a817c4b1cfc5/58528768057.pdfIn PDF document text
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_2a22fcf72134412d818b8c95576d9c3e.pdf?index=trueIn PDF document text
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_364bd57a75414314a7bdbc85ad1fd0e2.pdf?index=trueIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_93f7014b08e54ca085c8d30edaf5e8aa.pdf?index=trueIn PDF document text
    • http://xukajipovaru.epizy.com/grounded_theory_research_in_nursing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c67c9e17-e0e9-451e-86f6-86956668613f/best_book_to_learn_guitar_quora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9b330cc-6df6-4d51-a2e0-fc3f874da741/los_medios_de_comunicacin_en_la_sociedad_actual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8878118c-82b5-44b4-930d-940c3428542b/mtd_snowblower_maintenance_manual.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_off0000f29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 5748 bytes
SHA-256: 4ad7e5416bd5a61732d14b9f9b5694cbee3ddf74c73899ed0575a7e1f8c10f10
font_01_sfnt_off0001062e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062E 11096 bytes
SHA-256: f40f26fc17a7e7b7be73a49c9da094fc5e7b40a91a4931b69f3142218d6d9650