Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f997504a1d4af7…

MALICIOUS

PDF

82.3 KB Created: 2021-04-06 01:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 91bfefa98ea7219d67f104ab9cd983f4 SHA-1: 298949050dadb4f8a639a717f6046379dd424615 SHA-256: b0f997504a1d4af769223e4696a590e94d1f830155c886bcf2e7d8c560ebc49a
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains a large number of embedded URLs, many of which point to disposable domains and are likely used for phishing or malware distribution. The presence of a link farm heuristic further supports the malicious intent of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xajibur.ru/strik?utm_term=honda+gx390+pressure+washer+how+to+start PDF link annotation
    • http://demask.fun/gufusimomuxafubuwosreyl.pdfIn PDF document text
    • http://lotsmen.com/518143650590taha.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/xixuzudegalovanegome.pdfIn PDF document text
    • http://about-central.com/how_many_types_of_curriculum_evaluationvov5w.pdfIn PDF document text
    • http://graatorama.space/votanozoh4cxo.pdfIn PDF document text
    • http://suwubiwutej.iblogger.org/ignou_clinical_nutrition_book.pdfIn PDF document text
    • http://ribugiwegi.22web.org/characteristics_of_mini_computer.pdfIn PDF document text
    • http://getyourcredit.info/rafapukujhjw7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412757/normal_60304af404bb4.pdfIn PDF document text
    • http://guzoseta.getenjoyment.net/biology_class_10_ncert_book.pdfIn PDF document text
    • https://tafubevodila.weebly.com/uploads/1/3/4/0/134016741/gagidoturaxel.pdfIn PDF document text
    • https://likufuzojelawaf.weebly.com/uploads/1/3/5/2/135298946/dusonaguguzakemig.pdfIn PDF document text
    • http://kazimibi.getenjoyment.net/gestion_de_cadena_de_abastecimiento.pdfIn PDF document text
    • https://jozufibajas.weebly.com/uploads/1/3/0/9/130969385/dde93942b.pdfIn PDF document text
    • https://nanupubixo.weebly.com/uploads/1/3/0/9/130969545/pulalukopumoxifoduvi.pdfIn PDF document text
    • http://jofifuneku.medianewsonline.com/2020_calendar_one_page.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448103/normal_604391c87320c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kisutajanarij.rf.gd/witcher_3_guide.pdfIn PDF document text
    • http://laxuzoto.onlinewebshop.net/calais_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70b8ec9b-2045-4941-93cf-eb90c5afc56b/refifibuwegopoxevuxa.pdfIn PDF document text
    • http://melaworogafema.epizy.com/ruxuwadokavipeve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e0784b3-ae06-4e4a-863a-bee8343c6c6a/kung_fu_hustle_cast_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2932f4ff-0ec1-455e-a56e-389333d39617/how_to_clean_wahl_peanut_clippers.pdfIn PDF document text
    • http://kafalemanam.epizy.com/gakitera.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_off000101fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FE 5772 bytes
SHA-256: 7f567e0a0544c34c1b813065c1cd2e32a0a5d444db28136840457beb29f0174f
font_01_sfnt_off000115ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AB 11264 bytes
SHA-256: 89c8b13c106240b8024d3db5148a3d422a9d0d94efe31d808ef90ba6f5b189dd

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