Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8043afbb2dc61c8…

MALICIOUS

PDF

77.2 KB Created: 2021-04-18 20:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b86c05d50dfea191719e0ae72c63886e SHA-1: 9c9ab215cf46ff94ed7e5f9827f3a03a35ecc17f SHA-256: d8043afbb2dc61c8f161f34cf06a555473081d7f95431d35642702c26be1562b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, with a primary one directing to a site that appears to be a phishing lure related to academic writing. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple disposable hosting domains and link farm heuristics further supports a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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/strik?utm_term=how+to+write+a+research+report+in+apa+format PDF link annotation
    • http://sigisuzuk.getenjoyment.net/sanawerewola.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/lururisofuduzitisakanujo.pdfIn PDF document text
    • http://azorocheat1.xyz/91893719134rwtn1.pdfIn PDF document text
    • http://naxuvazexipok.sportsontheweb.net/jazidi.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/komasugolevir.pdfIn PDF document text
    • http://moitender.org/best_graphic_novels_for_grade_30za8n.pdfIn PDF document text
    • http://lobulezinovux.medianewsonline.com/integral_of_sin3x_sqrt_cos_x.pdfIn PDF document text
    • http://lassituda.online/jematibesyzdl8.pdfIn PDF document text
    • http://mitimewigupito.mypressonline.com/62365564558.pdfIn PDF document text
    • http://lologunaw.mygamesonline.org/91325236462.pdfIn PDF document text
    • http://viwavidif.getenjoyment.net/77290309611.pdfIn PDF document text
    • http://tometifo.getenjoyment.net/hong_kong_attractions_map.pdfIn PDF document text
    • http://sunufosabupes.scienceontheweb.net/98385596655.pdfIn PDF document text
    • http://kisuvok.scienceontheweb.net/a_journey_through_anglo_american_literature_answer_key.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/mevuzokekenojab/nubune.pdfIn PDF document text
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_db9cc96576544dbe9ac476e8c447bb8c.pdf?index=trueIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_761c971edb2046139d65a5b6af1a05c5.pdf?index=trueIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_7f022da240b246a3b9852c1857a9fdc3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/how_to_tell_if_a_cbc_is_viral_or_bacterial.pdfIn PDF document text
    • http://rujidafedisezu.atwebpages.com/name_the_three_main_types_of_intermolecular_forces.pdfIn PDF document text
    • http://jukasuxoseki.atwebpages.com/clan_brujah.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_off0000f1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 5276 bytes
SHA-256: b17beb46198bc3558cb85c038aa9fe7d4177796156346a98f449fb0553276117
font_01_sfnt_off000103c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 10464 bytes
SHA-256: 61ae707b268f679711aefc7b34d53de6c20a67a0b5dfff75560a7e9f42dd8a8b

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