Malicious PDF — malware analysis report

Static analysis result for SHA-256 5694f0507ba8c6e6…

MALICIOUS

PDF

80.5 KB Created: 2021-03-11 13:43:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7f0c047aed97776e084cb136d077f7a0 SHA-1: 5da62179c88d2febd4f05721fd226d0c334f65cf SHA-256: 5694f0507ba8c6e6914f37bf7d4856f35f42ca1ffb78ce8911523b8dc883f142
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/award?keyword=cultural+barriers+of+communication+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383470/normal_5fcd519369369.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382781/normal_5fe4c4d9c1e64.pdfIn PDF document text
    • https://tajamexuzoxobug.weebly.com/uploads/1/3/1/4/131410736/tufexisunuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382406/normal_5fe1841e2cbf8.pdfIn PDF document text
    • https://zujuwedidikaf.weebly.com/uploads/1/3/4/3/134375258/lulodezigetogafu.pdfIn PDF document text
    • http://witinub.iblogger.org/sigow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413474/normal_60206d7720e2c.pdfIn PDF document text
    • https://dewofawofuzujo.weebly.com/uploads/1/3/0/7/130775987/fetukujeku.pdfIn PDF document text
    • http://guferesuzas.22web.org/sidakamelor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462066/normal_6025f88bce3e1.pdfIn PDF document text
    • https://balawuwugo.weebly.com/uploads/1/3/4/6/134622143/zejaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gasigigi.rf.gd/faxewojemivepizat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c99cfe2-a6a0-49e9-b96e-a95d9a4ea31f/zubosu.pdfIn PDF document text
    • http://lomiwolidosin.rf.gd/coronary_artery_disease_treatment_guidelines_2016.pdfIn PDF document text
    • http://sivokag.epizy.com/adharam_movie_songs.pdfIn PDF document text
    • http://lamisegowa.epizy.com/what_is_modern_luxury_interior_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/868969ba-a854-4e58-9321-f67f7cd9d5c5/netutavuriwefa.pdfIn PDF document text
    • http://xilagerezob.epizy.com/fewugemunozaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28b0a8db-409e-4d0d-a65e-043ea79947f7/ximevajodabixux.pdfIn PDF document text
    • http://doxenobuso.epizy.com/1477991010.pdfIn PDF document text
    • http://penalat.rf.gd/calendario_2020_free_download.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_off0000fedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDD 5344 bytes
SHA-256: 0fc15509e48c8a60056f55bb79ca6944ea665fd2c2421431495827f2349f010c
font_01_sfnt_off000110ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EA 10436 bytes
SHA-256: dbb20e3fb91ed4cdaf7f32095904823b9e0aa55501bacc0c46b86ccbd548712a

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