Malicious PDF — malware analysis report

Static analysis result for SHA-256 215a437d0c6d64d4…

MALICIOUS

PDF

82.1 KB Created: 2021-04-04 03:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9c095c9c18d9a51c0776112d25ef711f SHA-1: 04733f72563c324f78e9acc7add54aa438800413 SHA-256: 215a437d0c6d64d4265066ece5c5b918db25c53cac20b06e893ef68bfa932ca2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, indicative of a link farm designed to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via the embedded URLs. No scripts were extracted, but the PDF structure itself is used to host the malicious links.

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 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.
  • 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://botokaw.ru/strik?utm_term=can+hiit+help+build+muscle PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464730/normal_5ffcb15b57064.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450156/normal_5fcd8afeeed09.pdfIn PDF document text
    • http://mezajozugabaso.getenjoyment.net/potential_barrier_in_quantum_mechanics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462362/normal_601af75624e36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473030/normal_5fca665c32967.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420237/normal_6023d57032fd5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404745/normal_5fc7703f18778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387056/normal_605c65acdeadb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/kenmore_elite_double_oven_gas_range_owners_manual.pdfIn PDF document text
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_798dbe83b503463a948133ceb51d82f3.pdf?index=trueIn PDF document text
    • http://damudonixidosa.epizy.com/xagukixe.pdfIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_0e3471f1a3f14f65a5103d84ddfd5424.pdf?index=trueIn PDF document text
    • http://sulaloweg.epizy.com/zotira.pdfIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_5b8c09dbc07e43a4b30649978aa6e157.pdf?index=trueIn PDF document text
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_6423499767a54f6f99362bf319480112.pdf?index=trueIn PDF document text
    • http://tosalovubel.epizy.com/seminar_report_on_biogas_plant.pdfIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_a4b48af18b8f43e09a409f6c55e94fc9.pdf?index=trueIn 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_off00010519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10519 5264 bytes
SHA-256: edc0ab1506db321e613070eb69839699dd25246cc1612f244aea77f58ac706cc
font_01_sfnt_off000116c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C8 10816 bytes
SHA-256: 7d54054216dc3a60192fc49c6f4a2a064a73b1d847a0d75128e41c60babe8d7d

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