Malicious PDF — malware analysis report

Static analysis result for SHA-256 c586433d00839e35…

MALICIOUS

PDF

91.3 KB Created: 2021-03-17 16:22:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cb67c37281dead5e395e83bf07392eda SHA-1: 061ef4e6bf85eb6ab0d3f3031e41ec0b67095605 SHA-256: c586433d00839e35dd8c9f254ad92e0d86a8cbdc1a0f23de4cd3978d4aed5bb9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/123?utm_term=jenkins+allure+report+path PDF link annotation
    • http://xuxodowenam.getenjoyment.net/probiotics_for_prevention_and_treatment_of_diarrhea.pdfIn PDF document text
    • https://pusesame.weebly.com/uploads/1/3/4/6/134662227/4475754.pdfIn PDF document text
    • https://xixolediz.weebly.com/uploads/1/3/4/5/134513169/nipasovibo_guvadufad_potawutarobenu_denotum.pdfIn PDF document text
    • https://milikosepawina.weebly.com/uploads/1/3/2/6/132696406/9693f3dce92b.pdfIn PDF document text
    • https://zokokemakate.weebly.com/uploads/1/3/1/4/131454090/feforiwebitu_fepumigafutafap_nuvizokujexedu_wulokugegap.pdfIn PDF document text
    • http://kunepuvobimamin.medianewsonline.com/how_to_email_better_business_bureau.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/administracion_financiera_libro.pdfIn PDF document text
    • http://zzzmmmmejjj.space/47661106279o822f.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/22990351976.pdfIn PDF document text
    • http://nububezobuto.22web.org/the_360_degree_leader_review.pdfIn PDF document text
    • http://bamuwapinofaro.iblogger.org/spring_boot_with_hibernate_template.pdfIn PDF document text
    • http://nicechange.space/drawing_tutorial_freeysedn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_1ba299bfa4d34b7a8993211ebcac01c0.pdf?index=trueIn PDF document text
    • http://jefitotirezakif.epizy.com/80430778102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0edf0272-3e51-4030-92d7-30f7d130e230/how_to_solve_for_half_life_in_math.pdfIn PDF document text
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_1a3b5c25a4ae4c29802b4787a44e3ddc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b8bad8d-548a-4cf9-8424-011169329503/matlab_function_syntax.pdfIn PDF document text
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_12291bb8ca884c2888c8e83bd8719946.pdf?index=trueIn PDF document text
    • http://womejus.rf.gd/fexetoza.pdfIn PDF document text
    • http://dajaxul.epizy.com/bonafide_certificate_karnataka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bfbc0da-5834-454c-80f8-d1fa5f2de4cb/77589899896.pdfIn PDF document text
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_d01601d1b65f44e99345e79d08850e64.pdf?index=trueIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_5e941edc90644fffafa41e1872e7608e.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_off00011b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B18 4960 bytes
SHA-256: 1ad425e6df471a288e62802d9f14b713ebcb7d5a021dbfd38001a2a75f900f49
font_01_sfnt_off00012bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF1 16020 bytes
SHA-256: 2f9704e375e27aae544a53bafd542cfe71fb21f5b93e4b2f1376aca58be125a2