Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c4691aa9f9c521…

MALICIOUS

PDF

68.5 KB Created: 2021-03-17 23:47:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0e57c398e13aa8944a017198ee78d23f SHA-1: 2d8bae67cbfe192a31e5c0052d8b346ff3589614 SHA-256: f5c4691aa9f9c52144dac9b3b87955edf5106aeef79070e0b70586c3874d5f0c
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting and leading to a URL containing 'strik' and 'utm_term=microsoft+word+2007+practical+exercises+pdf', suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=microsoft+word+2007+practical+exercises+pdf PDF link annotation
    • http://tryporte.xyz/windwalker_monk_guide_wowheada5s2h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467950/normal_603f089ecdf05.pdfIn PDF document text
    • https://degujipimisa.weebly.com/uploads/1/3/1/4/131453395/4114140.pdfIn PDF document text
    • http://youtube-subscribes.com/jewimuwebox.pdfIn PDF document text
    • http://optalpha.com/mugakodomuvoluwisisid3n9k1.pdfIn PDF document text
    • https://xoxomedeze.weebly.com/uploads/1/3/5/3/135308121/melukusopeme-xipomodimika-gipapuroxegeku.pdfIn PDF document text
    • http://eslivdrug.space/iaqualink_how_to_heat_poolchd9t.pdfIn PDF document text
    • https://zamosokajuzosa.weebly.com/uploads/1/3/4/6/134651904/3f1ab11ec7f4f6c.pdfIn PDF document text
    • http://itasda.online/vaxoxoxubomaxubiwatit4wpgj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411681/normal_604f3fecae150.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/f29bfa37-d619-4f28-b608-f1caa09c362f/ejercicios_de_ecuaciones_de_primer_grado_con_2_incognitas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/632581c8-fe0d-49f3-bfa0-ff26f022d02a/what_should_a_full_service_cover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e0197b8-4d73-4594-b338-3b65b9a29544/lagutekaxikugebonewesog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d46110b-34c4-4709-862a-834c371fb0b2/medical_terminology_systems_7th_edition_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34c6bc13-cdb9-4bec-804f-4f8921df4036/pomogelabasifozabutobig.pdfIn PDF document text
    • http://tuzuvas.rf.gd/175503683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/123ed3ce-9e8d-4c93-b6d8-307567dd6549/77866087959.pdfIn PDF document text
    • http://zijadafofitewop.rf.gd/bird_by_bird_full_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2aa85e7-1013-4395-a06c-cdd859ebc54e/lodge_cast_iron_recipes_for_chicken_and_potatoes.pdfIn PDF document text
    • http://latujetob.epizy.com/dafabirites.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_off0000cda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA7 5668 bytes
SHA-256: df6e3e74a63541544dd4fec28e32221dde5a1383b1029bab25112c072fbbdddb
font_01_sfnt_off0000e131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE131 10480 bytes
SHA-256: 773aa14fe82bee34be4d2d22f03421d181fb19e2ba67b1c3595ee0e65c1a23a6

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