Malicious PDF — malware analysis report

Static analysis result for SHA-256 1366a74cdbcf03f4…

MALICIOUS

PDF

87.9 KB Created: 2021-03-26 06:35:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 4633a7f758687940ce03765ea916c09e SHA-1: f3d20d238470f6dc0b1405f9a608bd25b9d56d49 SHA-256: 1366a74cdbcf03f4a6199cc39343a49f99914f2e98820cc71931ebdb88f418cc
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous external URIs, with a primary suspicious URL pointing to 'pelibifir.ru'. The document body, though heavily obfuscated, suggests a lure related to 'Enteral nutrition guidelines', likely a pretext for phishing or malware delivery. The presence of embedded URLs and the overall structure point towards a phishing attack leveraging a malicious document.

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 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://pelibifir.ru/123?utm_term=enteral+nutrition+guidelines PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481510/normal_5fee2a16e07c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413862/normal_604d9cea1d50a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406812/normal_5fcdb459ce8ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464330/normal_6059e8f3a7b19.pdfIn PDF document text
    • http://openchambre.xyz/kebokumoxae34ed.pdfIn PDF document text
    • http://shop-you.xyz/12451310396ihk03.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/ocean_of_siter3alz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445737/normal_5fc815775dae2.pdfIn PDF document text
    • http://trafikcezaodebayisi.com/gaxuwojonudesbfzws.pdfIn PDF document text
    • http://verification-help.business/90218147141kk4f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421224/normal_602c75757d54f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_792c06f299d94ffba563f5eefa80bb50.pdf?index=trueIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_1588f1d735b64d459123cf709723ecff.pdf?index=trueIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_07862643e3b14ee19e289c94611b487f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/estandares_y_expectativas_de_estudios_sociales_2017.pdfIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_386bdb851e084829b85b1d59167f13db.pdf?index=trueIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_af04a9c033c843a9aaf62a17da291152.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/xubibilebaxolekopafe.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/letezigololipaboxu.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/zatulo.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_off00011bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCF 4952 bytes
SHA-256: 8ef1ca52ed391df381135f61219e52a92f3cb8c886b089b830dd1e76cc44cefa
font_01_sfnt_off00012cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB0 11548 bytes
SHA-256: 37b9eacc5bb40c47989de991ef950a544d1316c8590c8b8688dceb94afe998a1

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