Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f02e6aea86f1e35…

MALICIOUS

PDF

88.0 KB Created: 2020-12-28 21:51:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 535ad19191f662e2a4600c8eb8d7b577 SHA-1: e9330fc0010b6043c8a3e65c8bdf50a2e8ae1548 SHA-256: 6f02e6aea86f1e35002d775975dcb4e34276e86f87f6ec0d1d5c5627a427dec6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=silver+shroud+quest+bug+hancock PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462980/normal_5fa44b423c9fa.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/Pwghcgc/beats_headphones_not_pairing_with_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvidomanale/gIiieha/dejejiturotuwabaxuzu.pdfIn PDF document text
    • https://nofefikow.weebly.com/uploads/1/3/4/5/134510094/diledik_luvegeleve_jetutis_lulefoxetapaneg.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvomuvugu/ieNhgid/74095771055.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/VR9OGcH/kunojotarijokoraxegagax.pdfIn PDF document text
    • https://cdn.sqhk.co/bixatavafut/ahcngie/kilumisifamamagaworezigu.pdfIn PDF document text
    • https://cdn.sqhk.co/bibunifez/eqjdpjg/endless_surfers_subway_runners_3d_print.pdfIn PDF document text
    • https://cdn.sqhk.co/juzogimuju/jjhFVQx/kuwezidaloxawalol.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/xamapebonijos/munura.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/tuwujitaw.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/balanza_de_laboratorio.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/swift_attorney_service_redwood_city_ca.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/consultant_job_planning_a_best_practice_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/415f2e11-fd90-4a6e-a5ca-28a5d73125bd/accu_chek_aviva_fehler_e_5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10948 3188 bytes
SHA-256: a773ec17c29cd2f31084aff0d3e0f4e02fe33fa35d17ecc51cff30ae1c6f620f
font_01_sfnt_off000114bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BD 5696 bytes
SHA-256: a9d0e4c0fcdf9f35668ba7056c19a61a38f9621867d8c48ee1077fc418feb9db
font_02_sfnt_off0001280f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280F 13260 bytes
SHA-256: c44936f8eebfd1dfd1cbd38e28c02662c6e4da0f943e440a06c0b417439b2dfb

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