Malicious PDF — malware analysis report

Static analysis result for SHA-256 57303f0ef7e7f034…

MALICIOUS

PDF

77.3 KB Created: 2021-06-12 00:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6776d3b47dfed970de14d004c180883c SHA-1: 04ff35bebc4f5736156d1f394ce63b677929457f SHA-256: 57303f0ef7e7f034728e862967ea536de4620d161a4fa14296fec8a11ef2f06b
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'pelibifir.ru', which is likely the malicious destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host multiple links on disposable hosting, further supporting a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=un+enlace+peptidico+se+forma PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493589/normal_6014f20757cd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410002/normal_600aadb4ec449.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454678/normal_6001cc6bef6e3.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4416671/normal_60b126eb2f03c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444885/normal_5fcc90c211344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474211/normal_6046fcb37b503.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367271/normal_5fd774f27cff8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460680/normal_605f4b6827cfc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/10b26992-0b2c-4997-804a-038b031046a4/65338879116.pdfIn PDF document text
    • http://gamaxidad.pbworks.com/f/sri_suktam_with_meaning_in_hindi.pdfIn PDF document text
    • http://vafobotigef.pbworks.com/w/file/fetch/144572463/kinixasi.pdfIn PDF document text
    • http://veweran.pbworks.com/f/zofixunawikatiwebarudono.pdfIn PDF document text
    • http://gozuwef.pbworks.com/f/dutenivujolodeku.pdfIn PDF document text
    • http://natutaliva.pbworks.com/f/jadedegamixufefibowosa.pdfIn PDF document text
    • http://rasetewi.pbworks.com/w/file/fetch/144965295/xulojirur.pdfIn PDF document text
    • http://litopure.pbworks.com/f/ziwexosabajozujavokeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbc57d33-3f85-48bb-b53d-9ed09f77c964/excel_online_training_classes.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/w/file/fetch/144854397/como_se_clasifican_las_celulas_segun_su_forma_y_tamao.pdfIn PDF document text
    • http://jetubabup.pbworks.com/f/patubiluxalarut.pdfIn PDF document text
    • http://fuxedemama.pbworks.com/w/file/fetch/144494193/42054902443.pdfIn PDF document text
    • http://pusavivo.pbworks.com/w/file/fetch/145106571/10_column_worksheet_excel_template.pdfIn PDF document text
    • http://lifuzopa.pbworks.com/w/file/fetch/144751320/73282125886.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_off0000ea0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0E 5292 bytes
SHA-256: 15191e4ee3a0f18755bfe6b1160f9b047e3f9afffe026a3ddd5e418996a740fe
font_01_sfnt_off0000fbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF9 13076 bytes
SHA-256: 73fb8b24c2008fb3eeed939ac99acc64172ee1af366f1231818897d76d90a20b

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