Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8b80500cd39379…

MALICIOUS

PDF

77.1 KB Created: 2021-05-30 11:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 67d47d67e861ed6e2481a9c859b32485 SHA-1: 05f17f48119461f57e8d5431a8ca30e97a61b9d8 SHA-256: 8c8b80500cd3937956dc3cf588b338c0b16054600042ec1a31edaaafadb954b4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The presence of a specific URL related to printer drivers suggests a lure to trick users into visiting malicious sites. ClamAV and ML heuristics confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=driver+para+impresora+samsung+ml-2165w PDF link annotation
    • https://siganubamisibu.weebly.com/uploads/1/3/4/1/134108806/zagivus_lasozije_bejutiko_satixufapefuz.pdfIn PDF document text
    • https://lavafijaxeb.weebly.com/uploads/1/3/0/7/130740432/afef673a4c60d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422628/normal_60480b088b671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478148/normal_602885971dc05.pdfIn PDF document text
    • https://mivebomuponi.weebly.com/uploads/1/3/1/3/131398008/1877836.pdfIn PDF document text
    • https://falababipudin.weebly.com/uploads/1/3/4/8/134847750/203155.pdfIn PDF document text
    • https://kowedeta.weebly.com/uploads/1/3/0/7/130775164/sazisaja_laxaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415291/normal_604e5e5da8589.pdfIn PDF document text
    • https://febujularezot.weebly.com/uploads/1/3/0/8/130813651/dikixoku_goviwogas_limomibofiwijo_zipiwevozotig.pdfIn PDF document text
    • https://faluwesidiji.weebly.com/uploads/1/3/0/7/130738597/kexezof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376371/normal_604a2b9855ddf.pdfIn PDF document text
    • https://nasorigabewa.weebly.com/uploads/1/3/4/5/134519214/wafapatus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484834/normal_5fd7c68ddb731.pdfIn PDF document text
    • https://xiwaxodo.weebly.com/uploads/1/3/4/3/134319271/mixalaj.pdfIn PDF document text
    • https://luvalebasewe.weebly.com/uploads/1/3/5/3/135326782/jezolobafuwakoma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446380/normal_6030447a5c6f5.pdfIn PDF document text
    • https://buxutagugumazas.weebly.com/uploads/1/3/4/0/134095839/vunejefuxugoda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473041/normal_60594bf32c263.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/3141395d-3234-41b4-a80f-db4fbc110625/solucionario_biologia_y_geologia_3_eso_anaya_suma_piezas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7065ec08-d6f0-40b2-ae84-d1601a6db4a5/buxemivufumagokuzogok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e846c937-db4a-4d11-8b7d-5a57a6585a74/4384071436.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_off0000e906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE906 5784 bytes
SHA-256: c869ea2aa95a1b89074c292a07ebd6fbbf23fadb802727a0b806f0d405442294
font_01_sfnt_off0000fcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC8 12788 bytes
SHA-256: 32d01b0bdbab07960ca4627b795d13f5dfa2390d35dfde5fee57c6c613ee85ca